<div class="block"></div>

body{
  margin: 0;
}
.block{
    height: 200px;
    width: 100%;
    position: relative;
    background: linear-gradient(to right, rgba(241,231,103,1) 0%, rgba(254,182,69,1) 100%);
}
.block:after{
    content: '';
    width: 100%;
    height: 100%;
    position: absolute;
    background: inherit;
    z-index: -1;
    bottom: 0;
    transform-origin: right bottom;
    transform: skewY(-3deg);
}

External CSS

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External JavaScript

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