How to Create Hollow Triangle in CSS

how to create Hollow triangle in css

Not exactly cross-browser but works. Hope I've understood your request.

http://jsfiddle.net/wmDNr/3/

 .triangle { 
     position: relative;
     width: 20px;
     margin-top: 100px;
 }
 .triangle>div { 
     width: 20px;
     height: 2px;
     background: red;
     margin-top: 100px;
 }

 .triangle>div:before {
     content: " ";
     display: block;
     width: 20px;
     height: 2px;
     background: red;
     -webkit-transform: rotate(56deg);
     -moz-transform: rotate(56deg);
     -ms-transform: rotate(56deg);
     transform: rotate(56deg);
     position: absolute;
     top: -8px;
     right: -5px;
 }
 .triangle>div:after {
     content: " ";
     display: block;
     width: 20px;
     height: 2px;
     background: red;
     -webkit-transform: rotate(-56deg);
     -moz-transform: rotate(-56deg);
     -ms-transform: rotate(-56deg);
     transform: rotate(-56deg);
     position: absolute;
     top: -8px;
     left: -5px;
 }

Triangle with CSS with border

Someone already posted a pretty good answer to this question: https://stackoverflow.com/a/18607208/1320911

http://jsfiddle.net/wmDNr/3/

 .triangle { 
     position: relative;
     width: 20px;
     margin-top: 100px;
 }
 .triangle>div { 
     width: 20px;
     height: 2px;
     background: red;
     margin-top: 100px;
 }

 .triangle>div:before {
     content: " ";
     display: block;
     width: 20px;
     height: 2px;
     background: red;
     -webkit-transform: rotate(56deg);
     -moz-transform: rotate(56deg);
     -ms-transform: rotate(56deg);
     transform: rotate(56deg);
     position: absolute;
     top: -8px;
     right: -5px;
 }
 .triangle>div:after {
     content: " ";
     display: block;
     width: 20px;
     height: 2px;
     background: red;
     -webkit-transform: rotate(-56deg);
     -moz-transform: rotate(-56deg);
     -ms-transform: rotate(-56deg);
     transform: rotate(-56deg);
     position: absolute;
     top: -8px;
     left: -5px;
 }

How to create a transparent triangle with border using CSS?

I've found a webkit-only solution, using the ▲ character:

.triangle {  -webkit-text-stroke: 12px black;  color: transparent;  font-size: 200px;}

<div class="triangle">▲</div>

Triangle in CSS inside a box

Creative use of borders to achieve this effect, no images were harmed in the following sample and you can even set the position of the arrow on the element itself - becomes more straightforward if you can hardcode it for your design.

HTML

<div class="top">
    <span class="arrow" style="left:40%"></span>
</div>

CSS

.top {
    background:url(http://blog.positscience.com/wp-content/uploads/2013/08/ice-cream3.jpg);
    background-size:cover;
    width:300px;
    height:300px;
    border:1px solid #888;
    position:relative;
    overflow:hidden;
}
.arrow {
    border:30px solid #aaa;
    border-bottom:none;
    border-color:transparent #aaa transparent #aaa;
    position:absolute;
    left:0;
    bottom:0;
}
.arrow:before, .arrow:after {
    content:'';
    position:absolute;
    width:5000px;
    bottom:0;
    height:30px;
    background:#aaa;
}
.arrow:before {
    right:30px;
}
.arrow:after {
    left:30px;
}

Working JSfiddle sample.

Or the full integrated sample here.

How to make 3-corner-rounded triangle in CSS

My best attempt: http://dabblet.com/gist/4592062

Pixel perfection at any size, uses simpler math than Ana's original solution, and is more intuitive in my opinion :)

.triangle { position: relative; background-color: orange; text-align: left;}.triangle:before,.triangle:after { content: ''; position: absolute; background-color: inherit;}.triangle,.triangle:before,.triangle:after { width:  10em; height: 10em; border-top-right-radius: 30%;}
.triangle { transform: rotate(-60deg) skewX(-30deg) scale(1,.866);}.triangle:before { transform: rotate(-135deg) skewX(-45deg) scale(1.414,.707) translate(0,-50%);}.triangle:after { transform: rotate(135deg) skewY(-45deg) scale(.707,1.414) translate(50%);}

<div class="triangle"></div>

Transparent hollow or cut out circle

You can achieve a transparent cut out circle with 2 different techniques :

1.SVG

The following examples use an inline svg. The first snippet uses the mask element to cut out the transparent circle and the second hollow circle is made with a path element. The circle is made with 2 arc commands :

With the mask element :

body{background:url('https://farm9.staticflickr.com/8760/17195790401_ceeeafcddb_o.jpg');background-size:cover;}

<svg viewbox="0 0 100 50" width="100%">
  <defs>
    <mask id="mask" x="0" y="0" width="80" height="30">
      <rect x="5" y="5" width="90" height="40" fill="#fff"/>
      <circle cx="50" cy="25" r="15" />
    </mask>
  </defs>
  <rect x="0" y="0" width="100" height="50" mask="url(#mask)" fill-opacity="0.7"/>    
</svg>

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