<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);
}