button {
  display: inline-block;
  border: none;
  background: none;
}
button span {
  display: block;
}

/* ====================== lines button ==================================================*/
.lines-button {
  padding: .6rem 0;
  transition: .3s;
  cursor: pointer;
  user-select: none;
  border-radius: 0.57143rem;
  outline: none!important;
  height: 100%;
  /* */
}
.lines-button:hover {
  opacity: 1;
}
.lines-button:active {
  transition: 0;
}

.lines
{
  top: -4px;
}

.lines, .lines:before, .lines:after
{
  display: inline-block;
  width: 2rem;
  height: 2px;
  background: #ecf0f1;
  border-radius: 0.28571rem;
  transition: 0.3s;
  position: relative;
}

.lines:before, .lines:after {
  position: absolute;
  left: 0;
  content: '';
  -webkit-transform-origin: 0.28571rem center;
  transform-origin: 0.28571rem center;
}
.lines:before {
  top: .55rem;
}
.lines:after {
  top: -.55rem;
}

.lines-button.open {
  -webkit-transform: scale3d(0.8, 0.8, 0.8);
  transform: scale3d(0.8, 0.8, 0.8);
}

.lines-button.x2 .lines {
  transition: background 0.3s 0.5s ease;
}
.lines-button.x2 .lines:before, .lines-button.x2 .lines:after {
  -webkit-transform-origin: 50% 50%;
  transform-origin: 50% 50%;
  transition: top 0.3s 0.6s ease, -webkit-transform 0.3s ease;
  transition: top 0.3s 0.6s ease, transform 0.3s ease;
}

.lines-button.x2.open .lines {
  transition: background 0.3s 0s ease;
  background: transparent;
}
.lines-button.x2.open .lines:before, .lines-button.x2.open .lines:after {
  transition: top 0.3s ease, -webkit-transform 0.3s 0.5s ease;
  transition: top 0.3s ease, transform 0.3s 0.5s ease;
  top: 0;
  width: 2.4rem;
}
.lines-button.x2.open .lines:before {
  -webkit-transform: rotate3d(0, 0, 1, 45deg);
  transform: rotate3d(0, 0, 1, 45deg);
}
.lines-button.x2.open .lines:after {
  -webkit-transform: rotate3d(0, 0, 1, -45deg);
  transform: rotate3d(0, 0, 1, -45deg);
}