Blame for static/styles.css

body {
  background: #343541;
  color: #ececf1;
  font-family: Inter, system-ui, sans-serif;
}

.sidebar {
  background: #202123;
  width: 260px;
}

.message.user {
  background: #343541;
}

.message.assistant {
  background: #444654;
}

input, textarea {
  background: #40414f;
  border-radius: 12px;
  color: white;
}
.input-bar {
  position: fixed;
  bottom: 0;
  width: 100%;
  background: #343541;
  box-shadow: 0 -1px 10px rgba(0,0,0,.3);
}
.message {
  animation: fadeIn .2s ease;
}
@keyframes fadeIn {
  from {opacity:0; transform:translateY(4px)}
  to {opacity:1}
}