redoc/demo/main.css

body {
  font-family: Verdana, Geneva, sans-serif;
  font-size: 14px;
  color: #333;
  margin: 0;
  line-height: 1.5;
  padding-top: 50px;
}

nav input, nav button  {
  font-size: 16px;
  height: 28px;
  box-sizing: border-box;
  vertical-align: middle;
  line-height: 1;
  outline: none;
}
nav header {
  float: left;
  margin-left: 20px;
  font-size: 25px;
  color: #00329F;
  font-weight: bold;
}

nav input {
  width: 50%;
  box-sizing: border-box;
  max-width: 500px;

  color: #555;
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
  -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
  box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
  -webkit-transition: border-color ease-in-out .15s,-webkit-box-shadow ease-in-out .15s;
  -o-transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
}

nav input:focus {
  border-color: #66afe9;
  outline: 0;
  -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075),0 0 8px rgba(102,175,233,.6);
  box-shadow: inset 0 1px 1px rgba(0,0,0,.075),0 0 8px rgba(102,175,233,.6);
}

nav button {
  background-color: #fff;
  color: #333;
  padding: 2px 10px;

  touch-action: manipulation;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  border: 1px solid #ccc;
  border-radius: 4px;
}

nav button:hover {
  background-color: #e6e6e6;
  border-color: #adadad;
}
nav button:active {
  background-color: #d4d4d4;
  border-color: #8c8c8c;
}

nav {
  width: 100%;
  height: 50px;
  line-height: 50px;
  text-align: center;
  background-color: white;
  border-bottom: 1px solid #ccc;
  position: fixed;
  top: 0;
  z-index: 1;
  box-sizing: border-box;
}

@media (min-width: 1000px) {
  nav header {
    position: absolute;
  }
}

@media (max-width: 500px) {
  nav input {
    width: 70%;
  }
  nav header {
    display: none;
  }
}