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HTML

              
                <button class="button button--gradient" type="button">Visit the website</button>
              
            
!

CSS

              
                $brand-primary: #080E30;
$border-width: 2px;

@mixin purple2blue() {
	background: #df19b5;
	background: linear-gradient(to right, #df19b5 33.33%,#2989d8 66.66%,#207cca 100%,#0597dd 100%);
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  
  height: 100vh;
    
  background-color: $brand-primary;
  
  text-align: center;
}

button {
  cursor: pointer;
}

.button {
  display: inline-block;

	padding: 1em 2em;
	border: none;

	text-transform: uppercase;
	text-align: center;
	font-weight: 600;
}

.button--gradient {
  @include purple2blue();

	position: relative;
	z-index: 0;

	color: #D6D1D1;

	font-weight: 700;

	// Add dark background inner to create border
	&:before {
		content: "";
		
		position: absolute;
		top: $border-width;
		bottom: $border-width;
		left: $border-width;
		right: $border-width;
		z-index: -1;

		display: block;

		background-color: $brand-primary;
	}

	.cssclippathpolygon & {
		clip-path: polygon(10px 0, calc(100% - 11px) 0, 100% 11px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 10px 100%, 0% calc(100% - 10px), 0% 11px);
	}
  
	.cssclippathpolygon &:before {
		clip-path: polygon(10px 1px, calc(100% - 11px) 1px, calc(100% - 1px) 11px, calc(100% - 1px) calc(100% - 10px), calc(100% - 10px) calc(100% - 1px), 10px calc(100% - 1px), 1px calc(100% - 10px), 1px 11px)
	}
}
              
            
!

JS

              
                // Test for polygon() support to progresively enchance. Firefox does not have support

// CSS Clip Path Polygon tests from https://codepen.io/shshaw/pen/yyOaqW
(function(Modernizr){

    // Here are all the values we will test. If you want to use just one or two, comment out the lines of test you don't need.
    var tests = [
      { name: 'svg', value: 'url(#test)' }, // False positive in IE, supports SVG clip-path, but not on HTML element
      { name: 'inset', value: 'inset(10px 20px 30px 40px)' },
      { name: 'circle', value: 'circle(60px at center)' },
      { name: 'ellipse', value: 'ellipse(50% 50% at 50% 50%)' },
      { name: 'polygon', value: 'polygon(50% 0%, 0% 100%, 100% 100%)' }
    ];

    var t = 0,
        name, value, prop;

    for (; t < tests.length; t++) {
      name = tests[t].name;
      value = tests[t].value;
      Modernizr.addTest('cssclippath' + name, function(){
        // Try using window.CSS.supports
        if ( 'CSS' in window && 'supports' in window.CSS ) {
          for (var i = 0; i < Modernizr._prefixes.length; i++) {
            prop = Modernizr._prefixes[i] + 'clip-path'
            
            if ( window.CSS.supports(prop,value) ) { return true; }
          }
          return false;
        }
        // Otherwise, use Modernizr.testStyles and examine the property manually
        return Modernizr.testStyles('#modernizr { '+Modernizr._prefixes.join('clip-path:'+value+'; ')+' }',function(elem, rule) {
          var style = getComputedStyle(elem),
              clip = style.clipPath;

          if ( !clip || clip == "none" ) {
            clip = false;

            for (var i = 0; i < Modernizr._domPrefixes.length; i++) {
              test = Modernizr._domPrefixes[i] + 'ClipPath';
              if ( style[test] && style[test] !== "none" ) {
                clip = true;
                break;
              }
            }
          }

          return Modernizr.testProp('clipPath') && clip;
        });
      });

    }

  })(Modernizr);
              
            
!
999px

Console