mangochat.css

body {
  font-family: sans-serif;
  background-color: #FFBF00;
  background-image:
    radial-gradient(ellipse farthest-corner at 0 0, rgba(0,0,0,.2) 0%, rgba(62,45,177, .3) 50%,
    rgba(255,255,255,.3) 95%), linear-gradient(to bottom, #FFc926, #FFDC73 100%);
  background-attachment: fixed;

  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;

  padding: 0;
  margin: 0;

  font-size: 16px;
  line-height: 1.5;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  min-height: 100%;
  background: white;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

header { flex: 1;  }
ul     { flex: 999; }
footer { flex: 1;  }

header, footer {
  background: #d2edf4;
  background-image: linear-gradient(to bottom, #FFBF00, #D9A200 100%);
  padding: 1rem;
}

#login-buttons {
  display: block;
}

h1 {
  font-size: 1.5rem;
  margin: 0;
  text-align: center;
}

form {
  margin: 0;
}

.new-message input {
  box-sizing: border-box;
  width: 100%;
  padding: 1rem;
  display: block;
  font-size: 1rem;
  border: none;
}

ul {
  margin: 0;
  padding: 0;
  background: white;
  min-height: 340px;
}


li {
  list-style: none;
  padding: 1rem;
  border-bottom: #eee solid 1px;
  opacity: 0; transform: translateX(-25px);
  -webkit-animation: slideIn ease .25s;
  -webkit-animation-fill-mode: forwards;
  -moz-animation: slideIn ease .25s;
  -moz-animation-fill-mode: forwards;
  animation: slideIn ease .25s;
  animation-fill-mode: forwards;
}

div .username {
  font-weight: bold;
}

@media (max-width: 600px) {
  li {
    padding: 12px 15px;
  }

  .new-message input {
    padding-top: 15px;
  }
}

@-webkit-keyframes slideIn {
  from { opacity: 0; transform: translateX(-25px); }
  to { opacity: 1; transform: translateX(0); }
}
@-moz-keyframes slideIn {
  from { opacity: 0; transform: translateX(-25px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-25px); }
  to { opacity: 1; transform: translateX(0); }
}