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: white;
  position: absolute;
}
nav input {
  width: 50%;
  box-sizing: border-box;
  max-width: 500px;
}

nav button {
  border: 1px solid #FFFFFF;
  cursor: pointer;
  color: white;
  background-color: #21476D;
  padding: 2px 10px;
}

nav {
  width: 100%;
  height: 50px;
  line-height: 50px;
  text-align: center;
  background-color: #053361;
  position: fixed;
  top: 0;
  z-index: 1;
}