Center Triangle at Bottom of Div
HtmlCssCss ShapesHtml Problem Overview
I am trying to have a triangle/arrow at the bottom of my hero but it is not responsive and doesn't work on mobile very well as the triangle floats off to the right and is not absolutely centered anymore.
How could I keep the triangle positioned in the absolute center at the bottom of the div at all times?
Example code here:
HTML:
<div class="hero"></div>
CSS:
.hero {
position:relative;
background-color:#e15915;
height:320px !important;
width:100% !important;
}
.hero:after,
.hero:after {
z-index: -1;
position: absolute;
top: 98.1%;
left: 70%;
margin-left: -25%;
content: '';
width: 0;
height: 0;
border-top: solid 50px #e15915;
border-left: solid 50px transparent;
border-right: solid 50px transparent;
}
Html Solutions
Solution 1 - Html
Can't you just set left
to 50%
and then have margin-left
set to -25px
to account for it's width: http://jsfiddle.net/9AbYc/
.hero:after {
content:'';
position: absolute;
top: 100%;
left: 50%;
margin-left: -50px;
width: 0;
height: 0;
border-top: solid 50px #e15915;
border-left: solid 50px transparent;
border-right: solid 50px transparent;
}
or if you needed a variable width you could use: http://jsfiddle.net/9AbYc/1/
.hero:after {
content:'';
position: absolute;
top: 100%;
left: 0;
right: 0;
margin: 0 auto;
width: 0;
height: 0;
border-top: solid 50px #e15915;
border-left: solid 50px transparent;
border-right: solid 50px transparent;
}
Solution 2 - Html
You can use following css to make an element middle aligned styled with position: absolute
:
.element {
transform: translateX(-50%);
position: absolute;
left: 50%;
}
With CSS having only left: 50%
we will have following effect:
While combining left: 50%
with transform: translate(-50%)
we will have following:
.hero {
background-color: #e15915;
position: relative;
height: 320px;
width: 100%;
}
.hero:after {
border-right: solid 50px transparent;
border-left: solid 50px transparent;
border-top: solid 50px #e15915;
transform: translateX(-50%);
position: absolute;
z-index: -1;
content: '';
top: 100%;
left: 50%;
height: 0;
width: 0;
}
<div class="hero">
</div>
Solution 3 - Html
Check this:
.hero1
{
width: 90%;
height: 200px;
margin: auto;
background-color: #e15915;
}
.hero2
{
width: 0px;
height: 0px;
border-style: solid;
margin: auto;
border-width: 90px 58px 0 58px;
border-color: #e15915 transparent transparent transparent;
line-height: 0px;
_border-color: #e15915 #000000 #000000 #000000;
_filter: progid:DXImageTransform.Microsoft.Chroma(color='#000000')
}
Solution 4 - Html
You could also use a CSS "calc" to get the same effect instead of using the negative margin or transform properties (in case you want to use those properties for anything else).
.hero:after,
.hero:after {
z-index: -1;
position: absolute;
top: 98.1%;
left: calc(50% - 25px);
content: '';
width: 0;
height: 0;
border-top: solid 50px #e15915;
border-left: solid 50px transparent;
border-right: solid 50px transparent;
}
Solution 5 - Html
I know this isn't a direct answer to your question, but you could also consider using clip-path, as in this question: https://stackoverflow.com/a/18208889/23341.