* {
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
  font-family: 'Roboto', sans-serif;
}
body {
  background: #d1d1d1;
}
.checkbox {
  display: none;
}
header {
  position: fixed;
  width: 100%;
  z-index: 10;
}
.header-container {
  width: 90%;
  position: relative;
  margin: 1rem auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header-logo {
  width: 3rem;
}
.btn-label {
  width: 2rem;
  height: 1.4rem;
}
.header-button {
  width: 2rem;
  height: 0.2rem;
  background: #000;
  position: absolute;
  top: 1.9rem;  
  transition: all 0.2s;
}
.header-button::before,
.header-button::after {
  content: "";
  width: 2rem;
  height: 0.2rem;
  background: #000;
  position: absolute;
  top: -0.6rem;
  transition: all 0.2s;
}
.header-button::after {
  top: 0.6rem;
}
.menu {
  background: #d1d1d1;
  width: 100%;
  height: 10rem;
  position: fixed;
  z-index: 9;
  top: -12rem;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  text-align: center;
  padding-top: 2rem;
  transition: all 0.5s;
}
ul {
  list-style: none;
}
li {
  margin: 0.5rem;
}
a {
  margin: 0 1rem;
  color: #000;
  text-decoration: none;
}
.checkbox:checked ~ .menu {
  background: #fff;
  top: 0rem;
}
.checkbox:checked + header .header-container label .header-button {
  background: none;
}
.checkbox:checked + header .header-container label .header-button::before {
  transform: rotate(35deg);
  top: 0;
}
.checkbox:checked + header .header-container label .header-button::after {
  transform: rotate(-35deg);
  top: 0;
}