CSS Inset Borders

Question

I need to create a solid color inset border. This is the bit of CSS I\'m using:

border: 10px inset rgba(51,153,0,0.65);

Unfortunately that cr

Answer 1

Simple SCSS solution with pseudo-elements

Live demo: https://codepen.io/vlasterx/pen/xaMgag

// Change border size here
$border-width: 5px;

.element-with-border {
	display: flex;
	height: 100px;
	width: 100%;
	position: relative;
	background-color: #f2f2f2;
	box-sizing: border-box;
	
	// Use pseudo-element to create inset border
	&:before {
		position: absolute;
		content: ' ';
		display: flex;
		border: $border-width solid black;
		left: 0;
		right: 0;
		top: 0;
		bottom: 0;
		border: $border-width solid black;
		// Important: We must deduct border size from width and height
		width: calc(100% - $border-width); 
		height: calc(100% - $border-width);
	}
}

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