main.scss

html {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after{
  box-sizing: inherit;

}
$dark : #171717;
$light : #fff;

body{
  padding: 20px;
  background-color: $dark;
}

.hamburger{
  padding: 10px;
  display: inline-block;
  cursor: pointer;
  background-color: transparent;
  border: 0;
  margin: 0;
}
.hamburger, .navigation {
  transition: transform .3s .1s ease-in-out;
}

.hamburger--active{
 transform: translateX(250px);
}

.hamburger__box{
  width: 42px;
  height: 24px;
  display: inline-block;
  position: relative;
}

.hamburger__inner{
  width: 100%;
  height: 3px;
  background-color: $light;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  transition:   background-color .1s .2s ease-in-out;
}

.hamburger__inner::before,
.hamburger__inner::after{
  content: '';
  width: 100%;
  height: 3px;
  background-color: $light;
  position: absolute;
  left: 0;
  transition:   transform .3s 0.2s ease-in-out;
}

.hamburger__inner::before{
  top: -10px;
}

.hamburger__inner::after{
  top: 10px;
}

.hamburger--active .hamburger__inner{
  background-color: transparent;
}

.hamburger--active .hamburger__inner::before{
  transform: translateY(10px) rotate(45deg);
}

.hamburger--active .hamburger__inner::after{
  transform: translateY(-10px) rotate(-45deg);
}

.navigation{
  height: 100vh;
  width: 250px;
  background-color: $light;
  position: absolute;
  top: 0;
  left: 0;
  transform: translateX(-250px);
}
.navigation--active{
  transform: translateX(0px);
}

.navigation__list{
  list-style: none;
  margin: 50px 0 0 20px;

}

.navigation__item{
  margin-bottom: 20px;

  a{
    text-decoration: none;
  }
}