#hamburger-icon {
  width: 25px;
  height: 16px;
  position: relative;
  display: block;
  margin: 13px auto;
}
#hamburger-icon .line {
  display: block;
  background: #ecf0f1;
  width: 25px;
  height: 3px;
  position: absolute;
  left: 0;
  border-radius: 1.5px;
  transition: all 0.4s;
  -webkit-transition: all 0.4s;
  -moz-transition: all 0.4s;
}
#hamburger-icon .line.line-1 {
  top: 0;
}
#hamburger-icon .line.line-2 {
  top: 50%;
}
#hamburger-icon .line.line-3 {
  top: 100%;
}
#hamburger-icon:hover .line-1, #hamburger-icon:focus .line-1 {
  transform: translateY(-1.5px);
  -webkit-transform: translateY(-1.5px);
  -moz-transform: translateY(-1.5px);
}
#hamburger-icon:hover .line-3, #hamburger-icon:focus .line-3 {
  transform: translateY(1.5px);
  -webkit-transform: translateY(1.5px);
  -moz-transform: translateY(1.5px);
}
#hamburger-icon.active .line-1 {
  transform: translateY(8px) translateX(0) rotate(45deg);
  -webkit-transform: translateY(8px) translateX(0) rotate(45deg);
  -moz-transform: translateY(8px) translateX(0) rotate(45deg);
}
#hamburger-icon.active .line-2 {
  opacity: 0;
}
#hamburger-icon.active .line-3 {
  transform: translateY(-8px) translateX(0) rotate(-45deg);
  -webkit-transform: translateY(-8px) translateX(0) rotate(-45deg);
  -moz-transform: translateY(-8px) translateX(0) rotate(-45deg);
}