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HTML

              
                <div class="wrapper">
    <div class="box-wrap">
        <div class="box one"></div>
        <div class="box two"></div>
        <div class="box three"></div>
        <div class="box four"></div>
        <div class="box five"></div>
        <div class="box six"></div>
    </div>
</div>
              
            
!

CSS

              
                $w-size: 200px;
$w-margin: -$w-size/2;
$b-size: 70%; //This is % based on $w-size. Use any value you want (that makes sense) and any unit that you would like (test it)
$box-wrapper-width: $b-size;
$box-wrapper-height: $b-size;
$box-wrapper-margin: calc((100% - #{$box-wrapper-height})/2) calc((100% - #{$box-wrapper-width})/2);

//clip-path: inset() doesn't work on firefox and IE, if anyone feels like making it work with SVG clipping, please drop me a link in comments, would like to see it. :) 

*,
*:before,
*:after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}


.wrapper {
	position: absolute;
    left: 50%;
    top: 50%;
    margin: $w-margin;
	width: $w-size;
	height: $w-size;
	background-color: transparent;
	border: none;
	-webkit-user-select: none;

	.box-wrap {
		width: $box-wrapper-width;
	    height: $box-wrapper-height;
		margin: $box-wrapper-margin;
	    position: relative;
	    transform: rotate(-45deg);

		.box {
			width: 100%;
		    height: 100%;
		    position: absolute;
		    left: 0;
		    top: 0;
            background: rgba(135, 0, 0, .6);
		    background: linear-gradient(to right, #141562, #486FBC, #EAB5A1, #8DD6FF, #4973C9, #D07CA7, #F4915E, #F5919E, #B46F89, #141562, #486FBC);
		    background-position: 0% 50%;
		    background-size: 1000% 1000%;
			visibility: hidden;

			&.one {
				animation:
				    moveGradient 15s infinite,
				    oneMove 3.5s infinite;
			}

			&.two {
				animation:
					moveGradient 15s infinite,
					twoMove 3.5s .15s infinite;
			}

			&.three {
				animation:
					moveGradient 15s infinite,
					threeMove 3.5s .3s infinite;
			}

			&.four {
				animation:
					moveGradient 15s infinite,
					fourMove 3.5s .575s infinite;
			}

			&.five {
				animation:
					moveGradient 15s infinite,
					fiveMove 3.5s .725s infinite;
			}

			&.six {
				animation:
					moveGradient 15s infinite,
					sixMove 3.5s .875s infinite;
			}
		}
	}
}

@keyframes moveGradient {

    to {
        background-position: 100% 50%
    }
}

@keyframes oneMove {

    0% {
        visibility: visible;
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    14.2857% {
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    28.5714% {
        clip-path: inset(35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    42.8571% {
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    57.1428% {
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    71.4285% {
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    85.7142% {
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    100% {
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
}

@keyframes twoMove {

    0% {
        visibility: visible;
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    14.2857% {
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    28.5714% {
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    42.8571% {
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    57.1428% {
        clip-path: inset(35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    71.4285% {
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    85.7142% {
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    100% {
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
}

@keyframes threeMove {

    0% {
        visibility: visible;
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    14.2857% {
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    28.5714% {
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    42.8571% {
        clip-path: inset(0% 70% 70% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    57.1428% {
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
    71.4285% {
        clip-path: inset(0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    85.7142% {
        clip-path: inset(35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    100% {
        clip-path: inset(35% 70% 35% 0 round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
}

@keyframes fourMove {

    0% {
        visibility: visible;
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    14.2857% {
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    28.5714% {
        clip-path: inset(35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    42.8571% {
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    57.1428% {
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
    71.4285% {
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    85.7142% {
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    100% {
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
}

@keyframes fiveMove {

    0% {
        visibility: visible;
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    14.2857% {
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    28.5714% {
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    42.8571% {
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    57.1428% {
        clip-path: inset(35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    71.4285% {
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    85.7142% {
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    100% {
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
}

@keyframes sixMove {

    0% {
        visibility: visible;
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    14.2857% {
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    28.5714% {
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    42.8571% {
        clip-path: inset(70% 0 0 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    57.1428% {
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    71.4285% {
        clip-path: inset(35% 0% 35% 70% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    85.7142% {
        clip-path: inset(35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }

    100% {
        clip-path: inset(70% 35% 0% 35% round 5%);
        animation-timing-function: cubic-bezier(0.86,  0,  0.07,  1);
    }
}
              
            
!

JS

              
                
              
            
!
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