wizard.css

.wizard__steps {
  list-style: none;
  padding: 16px;
}

.wizard__step {
    display: inline-block;
    line-height: 26px;
    margin: 0 9px 0 -10px;
    padding: 0 20px;
    position: relative;
    font-size: 18px;
    color: grey;
}

.wizard__step.is-active {
    color: black;
}

.wizard__step:before,
.wizard__step:after {
    border-right: 1px solid #666666;
    content: '';
    display: block;
    height: 50%;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    z-index: -1;
    -moz-transform: skewX(45deg);
    -ms-transform: skewX(45deg);
    -o-transform: skewX(45deg);
    -webkit-transform: skewX(45deg);
    transform: skewX(45deg);
}

.wizard__step:after {
    bottom: 0;
    top: auto;
    -moz-transform: skewX(-45deg);
    -ms-transform: skewX(-45deg);
    -o-transform: skewX(-45deg);
    -webkit-transform: skewX(-45deg);
    transform: skewX(-45deg);
}

.wizard__step:last-of-type:before, .wizard__step:last-of-type:after {
    display: none;
}

.wizard__content {
  height: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease-out;
}

.wizard__content.is-active {
  height: 100%;
  max-height: 1500px;
  transition: max-height 0.5s ease-in;
}