body {
  font-size: .875rem;
  background: grey;
}

.navbar-brand {
  font-size: 0.8rem;
}
.navbar button {
  width: 1.8rem;
  height: 1.8rem;
  font-size: 0.8rem;
  border-radius: 100%;
  padding: 2px;
}
.navbar .dropdown-toggle::after {
  display: none;
}

.navbar .hangup {
  transform: rotate(225deg);
}

.volume {
  position: absolute;
  width: 0.1%;
  min-width: 0.2em;
  max-height: 90%;
  right: 0.2em;
  bottom: 0.2em;
  opacity: 0.8;
}

main {
  padding-top: 48px;
}

.messages {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  z-index: 100;
  padding: 40px 0 48px 0;
  box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
}

#messages {
  position: absolute;
  width: 100%;
  height: calc(100vh - 88px);
  overflow-x: hidden;
  overflow-y: auto;
}

#message-input {
  position: absolute;
  width: 100%;
  height: 48px;
  bottom: 0;
  padding: 4px;
}

#message-input .input-group, #message-input .input-group input {
  height: 40px;
}