how to make triangle div? - html

Question

I want to make div like triangle. I describe clear my question by images in blow.
my code is:
<div class="rest_pack">
<img width="100%" src="<?= Yii::$app->request->baseUrl . '/files/upload/3.png' ?>">
<div class="row side_info">
<div class="top">
ساندویچ مخصوص
</div>
<div class="bottom">
5,500
تومان
</div>
</div>
</div>
css:
.rest_pack .side_info{
position: absolute;
width: 100%;
background-color: #FFF;
top: 100px;
opacity: 0.8;
}
.rest_pack .side_info .top{
text-align: center;
font-weight: bold;
font-size: 17px;
color: #3131AA;
padding-top:5px;
}
.rest_pack .side_info .bottom{
text-align: center;
font-weight: bold;
font-size: 16px;
color: #F63440;
padding-top:5px;
}
The result is:
but I want something like this.
I want to make red DIV.

Answer 1

Got it from CSS Tricks https://css-tricks.com/snippets/css/css-triangle/
<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>
CSS goes here :
.arrow-up {
width: 0;
height: 0;
border-left: 5px solid transparent;
border-right: 5px solid transparent;
border-bottom: 5px solid black;
}
.arrow-down {
width: 0;
height: 0;
border-left: 20px solid transparent;
border-right: 20px solid transparent;
border-top: 20px solid #f00;
}
.arrow-right {
width: 0;
height: 0;
border-top: 60px solid transparent;
border-bottom: 60px solid transparent;
border-left: 60px solid green;
}
.arrow-left {
width: 0;
height: 0;
border-top: 10px solid transparent;
border-bottom: 10px solid transparent;
border-right:10px solid blue;
}
Just change values and you get whatever Triangle you want

Answer 2

You can do it using :after selector and border-left, border-bottom to adjust triangle as you need.
like this:
.title{
position: absolute;
padding:25px;
bottom:0;
right:0;
z-index:1;
}
div {
position: relative;
width: 500px;
height: 300px;
background-image: url("http://i.stack.imgur.com/ys1Jo.png");
}
div:after {
position: absolute;
content: '';
width: 0;
height: 0;
bottom: 0;
border-left: 500px solid transparent;
border-bottom: 130px solid rgb(0, 114, 255);
-moz-transform: scale(0.999);
-webkit-backface-visibility: hidden;
}
<div class="test">
<span class="title">Enter Text Here</span>
</div>

Answer 3

Please try below code
HTML
<div class="main">
<a rel="nofollow" href="http://i.stack.imgur.com/ys1Jo.png"><img alt="enter image description here" src="http://i.stack.imgur.com/ys1Jo.png"> </a>
</div>
CSS
.main { border: 1px solid red; border-radius: 5px 0 5px 5px; }