* {
  margin: 0;
  padding: 0;
}
h1 {
    font-size: 30px;
    padding: 20px;
}
body {
  font-family: 'Raleway', sans-serif;
  max-width: 50%;
  margin: 0 auto;
  background-repeat: no-repeat;
  background-size: cover;
  margin-right: 420px;
  margin-top: -90px;
}
.header input {
  padding: 13px;
  width: 60%;
  border: 2px solid #000;
}
.header {
  margin-top: 100px;
  font-size: 20px;
  width: 100%;
  padding: 6% 18%;
}
.btn {
  display: inline-block;
  color: #000000;
  line-height: 40px;
  padding: 0 40px;
  border: 2px solid #000000;
  text-decoration: none;
  text-transform: uppercase;
  font-size: 15px;
  font-weight: bold;
  position: relative;
  z-index: 0;
}
.btn,
.btn:after {
  -webkit-transition: all .25s ease;
  -moz-transition: all .25s ease;
  -ms-transition: all .25s ease;
  -o-transition: all .25s ease;
  transition: all .25s ease;
}
.btn:hover {
  color: #fff;
}
.btn:after {
  content: "";
  position: absolute;
  top: 20%;
  left: 20%;
  bottom: 20%;
  right: 20%;
  background-color: transparent;
  z-index: -1;
}
.btn:hover:after {
  background-color: red;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

#article {
  margin-left: 13%;
}