How to add a border to a jagged border container - css

Question

Hello I am having trouble trying to come up with a way of adding a border of 1px to a container with a jagged border such as:
https://codepen.io/swizenfeld/pen/ZyBybW
body {
background: #f4f4f4;
}
.edge {
width: 100%;
height: 400px;
background: #fff;
margin-top: 30px;
}
.edge:before {
content: " ";
display: block;
position: relative;
width: 100%;
top:-30px;
height:30px;
background: linear-gradient(135deg, transparent 75%, white 76%) 0 50%,
linear-gradient(-135deg, transparent 75%, white 76%) 0 50%;
background-repeat: repeat-x;
background-size: 30px 30px, 30px 30px;
}
<div class="edge"></div>
Any ideas?

Answer 1

You need to add more linear-gradient() to show jagged border
body {
background: #f4f4f4;
}
.edge {
width: 100%;
height: 400px;
background: #fff;
margin-top: 30px;
}
.edge:before {
content: " ";
display: block;
position: relative;
width: 100%;
top:-30px;
height:30px;
background: linear-gradient(135deg, transparent 75%, white 76%) 0 50%, linear-gradient(-135deg, transparent 75%, white 76%) 0 50%, linear-gradient(45deg, red 30%, transparent 0%), linear-gradient(-45deg, red 30%, transparent 0%);
background-repeat: repeat-x;
background-size: 30px 30px, 30px 30px;
}
<div class="edge"></div>
For border-left, -bottom, -right, try to play with below snippet and see the comment also given for css properties.
body {
background: #ccc;
}
.edge {
width: 100%;
height: 400px;
background: white;
margin-top: 30px;
border-left:2px solid red;
border-bottom:2px solid red;
border-right:2px solid red;
position:relative; /*make it relative*/
}
.edge:after {
content: " ";
display: block;
position:absolute; /*make it absolute*/
width: 100%;
top:-6px; /* play with top and height too*/
height:23px;
/*background: linear-gradient(135deg, transparent 75%, white 76%) 0 50%, linear-gradient(-135deg, transparent 75%, white 76%) 0 50%, linear-gradient(45deg, red 30%, transparent 0%), linear-gradient(-45deg, red 30%, transparent 0%);*/
background: linear-gradient(45deg,white 14px, red 16px, transparent 17px), linear-gradient(-45deg, white 14px, red 16px, #ccc 17px);
background-repeat: repeat-x;
background-size: 30px 30px, 30px 30px;
}
<div class="edge"></div>