discourse/app/assets/stylesheets/common/base/activation.scss

// Styles used before the user is logged into discourse. For example, activating their
// account or changing their email.

.account-activation-page {
  .desktop-view & {
    background: var(--primary-very-low);
  }
  #main-outlet-wrapper {
    display: block;
    .sidebar-wrapper {
      display: none;
    }
  }
  #main-outlet {
    padding: 0;
    height: 100%;
  }
  #simple-container {
    display: flex;
    align-items: center;
    box-sizing: border-box;
    border-radius: 10px;
    width: 100%;
    padding: 20px;
    justify-content: center;
    margin-top: var(--header-offset);
    .account-created {
      .ac-message {
        font-size: var(--font-up-1);
        line-height: var(--line-height-large);
      }
      .activation-controls {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5em;
      }
      .ac-page {
        border-radius: 10px;
        margin-top: 25px;
      }
    }
  }
}

.activate-account {
  .activate-title {
    text-align: center;
    .waving-hand {
      height: 32px;
      margin-bottom: 13px;
    }
  }
  #activate-account-button {
    margin-top: 20px;
    margin-left: auto;
    margin-right: auto;
    display: block;
  }
  .perform-activation {
    border-top: 6px solid var(--tertiary);
    box-shadow: 0 1px 10px 1px rgba(var(--primary-low-rgb), 1.25);
    border-radius: 10px;
    padding: 1em 2.5em 1em 2.5em;
    .image {
      width: 150px;
      margin: auto;
      padding-bottom: 1em;
    }
  }
}