blockscout/apps/block_scout_web/assets/css/components/_button.scss

$button-primary-color: $primary !default;
$button-secondary-color: $secondary !default;

.button, .btn {
  border-radius: 2px;
  border: none;
  cursor: pointer;
  display: inline-block;
  line-height: 1.2;
  padding: 10px 16px;
  text-align: center;
  text-decoration: none;
  transition: $transition-cont;
  white-space: nowrap;

  &-primary {
    background-color: $button-primary-color;
    border: 1px solid $button-primary-color;
    color: #fff;

    &:hover,
    &:focus {
      background-color: darken($button-primary-color, 10%);
      border-color: darken($button-primary-color, 10%);
      color: #fff;
      outline: none !important;
      text-decoration: none;
    }

    &:disabled {
      background-color: $gray-300;
      color: $gray-800;
      text-decoration: none;
    }
  }

  &-secondary {
    background-color: #fff;
    border: 1px solid $button-secondary-color;
    color: $button-secondary-color;
    font-weight: 400;

    &:hover,
    &:focus {
      background-color: darken($button-secondary-color, 10%);
      border-color: darken($button-secondary-color, 10%);
      color: #fff;
      outline: none !important;
      text-decoration: none;
    }
  }

  &-xs {
    font-size: 11px;
    padding: 6px 9px 6px !important;
  }

  &-sm {
    font-size: 12px;
    padding: 10px 20px 10px;
  }

  &-md {
    font-size: 1.5rem;
    padding: 15px 30px 15px;
  }

  &-lg {
    font-size: 1.5rem;
    padding: 20px 60px 20px;
  }

  &-danger {
    background-color: #dc3545 !important;
    border: 1px solid #dc3545 !important;
  }

  // Block button
  // -------------------------

  &-block {
    display: block;
    width: 100%;
  }

  &-disabled,
  &:disabled {
    background-color: $gray-300;
    color: $gray-500;
    text-decoration: none;
  }
}

// Vertically space out multiple block buttons
.button-block + .button-block {
  margin-top: 5px;
}

.spinner {
  background-image: url('/images/spinner.svg');
  background-position: right;
  background-repeat: no-repeat;
  background-size: 30px;
}