discourse/app/assets/stylesheets/common/admin/emails.scss

// Styles for admin/emails

// Emails
.email-list {
  .filters input {
    width: 100%;
  }
  .time {
    width: 50px;
  }
  .reply-key {
    display: block;
    font-size: $font-down-1;
    color: var(--primary-medium);
  }
  .username div {
    max-width: 180px;
    @include ellipsis;
  }
  .addresses p {
    margin: 2px 0;
    max-width: 200px;
    @include ellipsis;
  }
  .sent-email-address a {
    // prevent long email addresses from breaking the layout
    display: inline-block;
    max-width: 300px;
    overflow-wrap: break-word;
  }
}

.incoming-emails {
  .control-group {
    margin: 8px 0;
  }
  .controls {
    margin-left: 110px;
  }
  p {
    margin: 5px 10px;
  }
  .error-description {
    color: var(--primary-medium);
    font-size: $font-down-1;
  }
  hr {
    margin: 0;
  }
  label {
    font-weight: bold;
    float: left;
    width: 100px;
    text-align: right;
    margin: 0 10px;
  }
  ul {
    list-style: none;
    margin: 0 10px;
  }
  textarea {
    width: 95%;
    height: 150px;
    font-family: monospace;
    box-shadow: none;
  }
}

.admin-list-item {
  width: 100%;
  border-top: 1px solid var(--primary-low);
  padding: 0.25em 0;
}

.email-preview {
  .digest-refresh-button {
    margin: 0 0.5em;
  }
}

.email-preview-digest {
  .controls {
    margin: 1em 0.5em;
    input[type="text"] {
      margin-bottom: 0;
    }
    label {
      display: inline;
    }
  }
  .preview-output iframe {
    width: 100%;
    height: 600px;
    border-width: 1px;
  }
}

.email-advanced-test {
  .admin-controls {
    display: block;
  }

  .email-body {
    width: 95%;
    height: 150px;
    font-family: monospace;
  }
}