a {
  color: #000;
  text-decoration: none;
}

strong {
  font-weight: bold;
}

em {
  font-style: italic;
}

.clearfix:after {
  content: '';
  display: block;
  clear: both;
}

.no-scroll {
  overflow: hidden;
}

.wrapper {
  width: 980px;
  margin: auto;
}
@media (max-width: 768px) {
  .wrapper {
    width: 100%;
  }
}

/**********/
/* HEADER */
/**********/

header {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  -webkit-transition: all ease 0.8s;
  transition: all ease 0.8s;
  background: #fff;
  border-bottom: 3px solid black;
  text-align: center;
  z-index: 50;
}

header.scrolled {
  top: 0;
  opacity: 1;
}

header nav {
  display: inline-block;
  position: relative;
}

header nav .link {
  width: 200px;
  height: 50px;
  line-height: 50px;
  display: inline-block;
}

header nav .underline {
  width: 0;
  height: 2px;
  background: red;
  -webkit-transition: all ease 0.3s;
  transition: all ease 0.3s;
  position: absolute;
  bottom: 5px;
  margin-left: 100px;
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
}

header nav .underline.shown {
  width: 200px;
}