@import url('https://fonts.googleapis.com/css2?family=Oswald:400,700');
* {
  font-family: "Oswald", sans-serif;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #434750;
}

ul
{
  position: relative;
  transform: skewY(-15deg);
  
}

ul li{
  position: relative;
  list-style: none;
  width: 200px;
  background: #3e3f46;
  padding: 15px;
  z-index: var(--i);
  transition: .5s;
}
ul li:hover{
  background: #33a3ee;
  transform: translateX(-50px);
}
ul li::before{
  content: '';
  position: absolute;
  top: 0;
  left: -40px;
  width: 40px;
  height: 100%;
  background: #2e3133;
  transform-origin: right;
  transform: skewY(45deg);
  transition: .5s;
}
ul li:hover::before{
  background: #1f5378;
}
ul li::after{
  content: '';
  position: absolute;
  top: -40px;
  left: 0;
  width: 100%;
  height: 40px;
  background: #35383e;
  transform-origin: bottom;
  transform: skewX(45deg);
  transition: .5s;
}
ul li:hover::after{
  background: #2982b9;
}
ul li a{
  text-decoration: none;
  color: #999;
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
  transition: .5s;
}

ul li:hover a{
  color: #fff;
}
ul li:last-child::after{
  box-shadow: -120px 120px 20px rgba(0,0,0,0.25);
}