How to make Twitter bootstrap modal full screen

Css Problem Overview

<div id="myModal" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-body">
    <%= image_tag "Background.jpg" %>
  </div>
</div>

How do I make a twitter bootstrap modal popup full screen for the above code, I tried playing around with css but was not able get it the way I wanted. Can anyone please help me with it.

Css Solutions

Solution 1 - Css

I achieved this in Bootstrap 3 with the following code:

.modal-dialog {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.modal-content {
  height: auto;
  min-height: 100%;
  border-radius: 0;
}

In general, when you have questions about spacing / padding issues, try right+clicking (or cmd+clicking on mac) the element and select "inspect element" on Chrome or "inspect element with firebug" on Firefox. Try selecting different HTML elements in the "elements" panel and editing the CSS on the right in real-time until you get the padding / spacing you want.

Here is a live demo

Here is a link to the fiddle

Solution 2 - Css

I've came up with a "responsive" solution for fullscreen modals:

Fullscreen Modals that can be enabled only on certain breakpoints. In this way the modal will display "normal" on wider (desktop) screens and fullscreen on smaller (tablet or mobile) screens, giving it the feeling of a native app.

Implemented for Bootstrap 3 and Bootstrap 4. Included by default in Bootstrap 5.

Bootstrap v5

Fullscreen modals are included by default in Bootstrap 5: https://getbootstrap.com/docs/5.0/components/modal/#fullscreen-modal

Bootstrap v4

The following generic code should work:

.modal {
  padding: 0 !important; // override inline padding-right added from js
}
.modal .modal-dialog {
  width: 100%;
  max-width: none;
  height: 100%;
  margin: 0;
}
.modal .modal-content {
  height: 100%;
  border: 0;
  border-radius: 0;
}
.modal .modal-body {
  overflow-y: auto;
}

By including the scss code below, it generates the following classes that need to be added to the .modal element:

+---------------------+---------+---------+---------+---------+---------+
|                     |   xs    |   sm    |   md    |   lg    |   xl    | 
|                     | <576px  | ≥576px  | ≥768px  | ≥992px  | ≥1200px |
+---------------------+---------+---------+---------+---------+---------+
|.modal-fullscreen    |  100%   | default | default | default | default | 
+---------------------+---------+---------+---------+---------+---------+
|.modal-fullscreen-sm |  100%   |  100%   | default | default | default | 
+---------------------+---------+---------+---------+---------+---------+
|.modal-fullscreen-md |  100%   |  100%   |  100%   | default | default |
+---------------------+---------+---------+---------+---------+---------+
|.modal-fullscreen-lg |  100%   |  100%   |  100%   |  100%   | default |
+---------------------+---------+---------+---------+---------+---------+
|.modal-fullscreen-xl |  100%   |  100%   |  100%   |  100%   |  100%   |
+---------------------+---------+---------+---------+---------+---------+

The scss code is:

@mixin modal-fullscreen() {
  padding: 0 !important; // override inline padding-right added from js

  .modal-dialog {
    width: 100%;
    max-width: none;
    height: 100%;
    margin: 0;
  }

  .modal-content {
    height: 100%;
    border: 0;
    border-radius: 0;
  }

  .modal-body {
    overflow-y: auto;
  }

}

@each $breakpoint in map-keys($grid-breakpoints) {
  @include media-breakpoint-down($breakpoint) {
    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);

    .modal-fullscreen#{$infix} {
      @include modal-fullscreen();
    }
  }
}

Demo on Codepen: https://codepen.io/andreivictor/full/MWYNPBV/

Bootstrap v3

Based on previous responses to this topic (@Chris J, @kkarli), the following generic code should work:

.modal {
  padding: 0 !important; // override inline padding-right added from js
}

.modal .modal-dialog {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.modal .modal-content {
  height: auto;
  min-height: 100%;
  border: 0 none;
  border-radius: 0;
  box-shadow: none;
}

If you want to use responsive fullscreen modals, use the following classes that need to be added to .modal element:

.modal-fullscreen-md-down - the modal is fullscreen for screens smaller than 1200px.
.modal-fullscreen-sm-down - the modal is fullscreen for screens smaller than 922px.
.modal-fullscreen-xs-down - the modal is fullscreen for screen smaller than 768px.

Take a look at the following code:

/* Extra small devices (less than 768px) */
@media (max-width: 767px) {
  .modal-fullscreen-xs-down {
    padding: 0 !important;
  }
  .modal-fullscreen-xs-down .modal-dialog {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
  }
  .modal-fullscreen-xs-down .modal-content {
    height: auto;
    min-height: 100%;
    border: 0 none;
    border-radius: 0;
    box-shadow: none;
  } 
}

/* Small devices (less than 992px) */
@media (max-width: 991px) {
  .modal-fullscreen-sm-down {
    padding: 0 !important;
  }
  .modal-fullscreen-sm-down .modal-dialog {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
  }
  .modal-fullscreen-sm-down .modal-content {
    height: auto;
    min-height: 100%;
    border: 0 none;
    border-radius: 0;
    box-shadow: none;
  }
}

/* Medium devices (less than 1200px) */
@media (max-width: 1199px) {
  .modal-fullscreen-md-down {
    padding: 0 !important;
  }
  .modal-fullscreen-md-down .modal-dialog {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
  }
  .modal-fullscreen-md-down .modal-content {
    height: auto;
    min-height: 100%;
    border: 0 none;
    border-radius: 0;
    box-shadow: none;
  }
}

Demo is available on Codepen: https://codepen.io/andreivictor/full/KXNdoO.

Those who use Sass as a preprocessor can take advantage of the following mixin:

@mixin modal-fullscreen() {
  padding: 0 !important; // override inline padding-right added from js

  .modal-dialog {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
  }

  .modal-content {
    height: auto;
    min-height: 100%;
    border: 0 none;
    border-radius: 0;
    box-shadow: none;
  }

}

Solution 3 - Css

The chosen solution does not preserve the round corner style. To preserve the round corners, you should reduce the width and height a little bit and remove the border radius 0. Also it doesn't show the vertical scroll bar...

.modal-dialog {
  width: 98%;
  height: 92%;
  padding: 0;
}

.modal-content {
  height: 99%;
}

Solution 4 - Css

For bootstrap 4 I have to add media query with max-width: none

@media (min-width: 576px) {
  .modal-dialog { max-width: none; }
}

.modal-dialog {
  width: 98%;
  height: 92%;
  padding: 0;
}

.modal-content {
  height: 99%;
}

Solution 5 - Css

The following class will make a full-screen modal in Bootstrap:

.full-screen {
    width: 100%;
    height: 100%;
    margin: 0;
    top: 0;
    left: 0;
}

I'm not sure how the inner content of your modal is structured, this may have an effect on the overall height depending on the CSS that is associated with it.

Solution 6 - Css

for bootstrap 4

add classes :

.full_modal-dialog {
  width: 98% !important;
  height: 92% !important;
  min-width: 98% !important;
  min-height: 92% !important;
  max-width: 98% !important;
  max-height: 92% !important;
  padding: 0 !important;
}

.full_modal-content {
  height: 99% !important;
  min-height: 99% !important;
  max-height: 99% !important;
}

and in HTML :

<div role="document" class="modal-dialog full_modal-dialog">
	<div class="modal-content full_modal-content">

Solution 7 - Css

The snippet from @Chris J had some issues with margins and overflow. The proposed changes by @YanickRochon and @Joana, based on the fiddel from @Chris J can be found in the following jsfiddle.

That's the CSS code that worked for me:

.modal-dialog {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
}
.modal-content {
    height: 100%;
    min-height: 100%;
    height: auto;
    border-radius: 0;
}

Solution 8 - Css

For bootstap 4.5: I just copied this code from bootstap 5.scss to my sass and its amazing:

@media (max-width: 1399.98px) 
  .modal-fullscreen-xxl-down 
    width: 100vw
    max-width: none
    height: 100%
    margin: 0
  
  .modal-fullscreen-xxl-down .modal-content 
    height: 100%
    border: 0
    border-radius: 0
  
  .modal-fullscreen-xxl-down .modal-header 
    border-radius: 0
  
  .modal-fullscreen-xxl-down .modal-body 
    overflow-y: auto
  
  .modal-fullscreen-xxl-down .modal-footer 
    border-radius: 0

For html:

<!-- Full screen modal -->
<div class="modal-dialog modal-fullscreen-xxl-down">
  ...
</div>

Its all about controling margin, width and height of the right div.

Solution 9 - Css

You need to set your DIV tags as below.

Find the more details > http://thedeveloperblog.com/bootstrap-modal-with-full-size-and-scrolling

</style>
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
   More Details
</button>
</br>
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-content">
        <div class="container">;
          <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
            <h3 class="modal-title" id="myModalLabel">Modal Title</h3>
          </div>
              <div class="modal-body" >
                Your modal text 
              </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
          </div>
        </div>
    </div>                                      
</div>

Solution 10 - Css

.modal {
        padding: 0 !important;
    }
        .modal .modal-dialog {
            width: 100%;
            max-width: none;
            height: 100%;
            margin: 0;
        }
        .modal .modal-content {
            height: 100%;
            border: 0;
            border-radius: 0;
        }
        .modal .modal-body {
            overflow-y: auto;
        }

This is way perfect working in my case Thanks alot

Solution 11 - Css

**If you want to have the Modal Bigger than the normal Then No need of writing the .css code, we can directly write the class of bootstrap modal **

<div class="modal fade" id="mappingModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-xl">

Only modal-dialog modal-xl and done.

Solution 12 - Css

My variation of the solution: (scss)

  .modal {
        .modal-dialog.modal-fs {
            width: 100%;
            margin: 0;
            box-shadow: none;
            height: 100%;
            .modal-content {
                border: none;
                border-radius: 0;
                box-shadow: none;
                box-shadow: none;
                height: 100%;
            }
        }
    }

(css)

.modal .modal-dialog.modal-fs {
  width: 100%;
  margin: 0;
  box-shadow: none;
  height: 100%;
}
.modal .modal-dialog.modal-fs .modal-content {
  border: none;
  border-radius: 0;
  box-shadow: none;
  box-shadow: none;
  height: 100%;
}

Solution 13 - Css

.modal.in .modal-dialog {
 width:100% !important; 
 min-height: 100%;
 margin: 0 0 0 0 !important;
 bottom: 0px !important;
 top: 0px;
}


.modal-content {
    border:0px solid rgba(0,0,0,.2) !important;
    border-radius: 0px !important;
    -webkit-box-shadow: 0 0px 0px rgba(0,0,0,.5) !important;
    box-shadow: 0 3px 9px rgba(0,0,0,.5) !important;
    height: auto;
    min-height: 100%;
}

.modal-dialog {
 position: fixed !important;
 margin:0px !important;
}

.bootstrap-dialog .modal-header {
    border-top-left-radius: 0px !important; 
    border-top-right-radius: 0px !important;
}


@media (min-width: 768px)
.modal-dialog {
    width: 100% !important;
    margin: 0 !important;
}

Solution 14 - Css

Use This:

.modal-full {
    min-width: 100%;
    margin: 0;
}

.modal-full .modal-content {
    min-height: 100vh;
}

and so:

<div id="myModal" class="modal" role="dialog">
    <div class="modal-dialog modal-full">
        <!-- Modal content-->
        <div class="modal-content ">
            <div class="modal-header ">                    
                <button type="button" class="close" data-dismiss="modal">&times; 
                </button>
                <h4 class="modal-title">hi</h4>
            </div>
            <div class="modal-body">
                <p>Some text in the modal.</p>
            </div>
        </div>

    </div>
</div>

Content Type	Original Author	Original Content on Stackoverflow
Question	Hrishikesh Sardar	View Question on Stackoverflow
Solution 1 - Css	Chris J	View Answer on Stackoverflow
Solution 2 - Css	andreivictor	View Answer on Stackoverflow
Solution 3 - Css	Esteban	View Answer on Stackoverflow
Solution 4 - Css	A. Morel	View Answer on Stackoverflow
Solution 5 - Css	micjamking	View Answer on Stackoverflow
Solution 6 - Css	Vlad	View Answer on Stackoverflow
Solution 7 - Css	kkarli	View Answer on Stackoverflow
Solution 8 - Css	MTriple	View Answer on Stackoverflow
Solution 9 - Css	BenW	View Answer on Stackoverflow
Solution 10 - Css	Avinash	View Answer on Stackoverflow
Solution 11 - Css	Avinash	View Answer on Stackoverflow
Solution 12 - Css	Rafael Herscovici	View Answer on Stackoverflow
Solution 13 - Css	Alireza Pars	View Answer on Stackoverflow
Solution 14 - Css	hojjat.mi	View Answer on Stackoverflow