body {
  background-image:
          radial-gradient(circle, rgba(173, 168, 255, 1) 0%, rgba(4, 73, 118, 1) 16%, rgba(0, 0, 0, 1) 100%);
  background-size: cover;
  background-attachment: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  position: relative;
  margin: 0;
  padding: 0;
  color: white;
  font-family: 'Roboto', sans-serif;
}

a:link, a:visited {
  border-radius: 25px;
  background-color: #f44336;
  color: white;
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

a:hover, a:active {
  background-color: red;
}

body::before {
  z-index: -1;
  content: '';
  background-repeat: no-repeat;
  background-position: right center;
  background-size: auto 150%;
  height: 100%;
  width: calc( 100% + 300px );
  position: fixed;
  top: 0;
  right: 50%;
  opacity: 0.2;
}

.logo {
  margin-top: 10px;
  width: 95%;
  max-width: 450px;
  text-align: center;
}