message: Manual server entry UI improvements
diff: <style>
  :host {
  text-align: center;
  + --code-mixin: {
  + color: var(--dark-gray);
  + font-size: 14px;
  + font-family: RobotoMono-Regular, monospace;
  + line-height: 24px;
  + word-break: break-all;
  + }
  }
  .card {
  color: var(--light-gray);
  }
  paper-textarea {
  --iron-autogrow-textarea: {
  - color: var(--dark-gray);
  - font-size: 14px;
  - font-family: RobotoMono-Regular, monospace;
  - line-height: 24px;
  - word-break: break-all;
  + @apply --code-mixin;
  }
  + --paper-input-container-underline: {
  + display: none;
  }
  - /* TODO: Seems like a @mixin would help avoid duplication. */
  - .code, #command {
  - color: var(--dark-gray);
  - font-size: 14px;
  - font-family: RobotoMono-Regular, monospace;
  - line-height: 24px;
  - word-break: break-all;
  + --paper-input-container-underline-focus: {
  + display: none;
  + }
  + }
  + .code, #command, paper-textarea {
  + @apply --code-mixin;
  }
  iron-icon {
  display: inline-block;
  