clients/web/css/compose.css

:root {
  --color-focus-border: #5677fc;
}

.compose {
  background-color: var(--color-background-light);
  padding: 8px;
}

.compose form,
.compose input {
  height: 100%;
  width: 100%;
}

.compose input {
  background-color: white;
  border: 1px solid var(--color-divider);
  border-radius: 4px;
  font-size: 16px;
  padding: 8px;
}

.compose input:focus {
  border: 1px solid var(--color-focus-border);
  outline: none;
}