picocss/scss/content/_button.scss

/**
 * Button
 */

// Reboot based on :
// - normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css
// - sanitize.css v12.0.1 | CC0 1.0 Universal | github.com/csstools/sanitize.css
// ––––––––––––––––––––

// 1. Change the font styles in all browsers
// 2. Remove the margin in Firefox and Safari
// 3. Show the overflow in Edge
button {
  margin: 0; // 2
  overflow: visible; // 3
  font-family: inherit; // 1
  text-transform: none; // 1
}

// Correct the inability to style clickable types in iOS and Safari
button,
[type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
}

// Remove the inner border and padding in Firefox
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  padding: 0;
  border-style: none;
}

// Pico
// ––––––––––––––––––––

button {
  display: block;
  width: 100%;
  margin-bottom: var(--spacing);
}

[role="button"] {
  display: inline-block;
  text-decoration: none;
}

button,
input[type="submit"],
input[type="button"],
input[type="reset"],
[role="button"] {
  --background-color: var(--primary);
  --border-color: var(--primary);
  --color: var(--primary-inverse);
  --box-shadow: var(--button-box-shadow, 0 0 0 rgba(0, 0, 0, 0));
  padding: var(--form-element-spacing-vertical)
    var(--form-element-spacing-horizontal);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  outline: none;
  background-color: var(--background-color);
  box-shadow: var(--box-shadow);
  color: var(--color);
  font-weight: var(--font-weight);
  font-size: 1rem;
  line-height: var(--line-height);
  text-align: center;
  cursor: pointer;

  @if $enable-transitions {
    transition: background-color var(--transition),
      border-color var(--transition), color var(--transition),
      box-shadow var(--transition);
  }

  &[aria-current],
  &:hover,
  &:active,
  &:focus {
    --background-color: var(--primary-hover);
    --border-color: var(--primary-hover);
    --box-shadow: var(--button-hover-box-shadow, 0 0 0 rgba(0, 0, 0, 0));
    --color: var(--primary-inverse);
  }

  &:focus {
    --box-shadow: var(--button-hover-box-shadow, 0 0 0 rgba(0, 0, 0, 0)),
      0 0 0 var(--outline-width) var(--primary-focus);
  }
}

// .secondary, .contrast & .outline
@if $enable-classes {

  // Secondary
  button.secondary,
  input[type="submit"].secondary,
  input[type="button"].secondary,
  input[type="reset"],
  [role="button"].secondary {
    --background-color: var(--secondary);
    --border-color: var(--secondary);
    --color: var(--secondary-inverse);
    cursor: pointer;

    &[aria-current],
    &:hover,
    &:active,
    &:focus {
      --background-color: var(--secondary-hover);
      --border-color: var(--secondary-hover);
      --color: var(--secondary-inverse);
    }

    &:focus {
      --box-shadow: var(--button-hover-box-shadow, 0 0 0 rgba(0, 0, 0, 0)),
        0 0 0 var(--outline-width) var(--secondary-focus);
    }
  }

  // Contrast
  button.contrast,
  input[type="submit"].contrast,
  input[type="button"].contrast,
  input[type="reset"].contrast,
  [role="button"].contrast {
    --background-color: var(--contrast);
    --border-color: var(--contrast);
    --color: var(--contrast-inverse);

    &[aria-current],
    &:hover,
    &:active,
    &:focus {
      --background-color: var(--contrast-hover);
      --border-color: var(--contrast-hover);
      --color: var(--contrast-inverse);
    }

    &:focus {
      --box-shadow: var(--button-hover-box-shadow, 0 0 0 rgba(0, 0, 0, 0)),
        0 0 0 var(--outline-width) var(--contrast-focus);
    }
  }

  // Outline (primary)
  button.outline,
  input[type="submit"].outline,
  input[type="button"].outline,
  input[type="reset"].outline,
  [role="button"].outline {
    --background-color: transparent;
    --color: var(--primary);

    &[aria-current],
    &:hover,
    &:active,
    &:focus {
      --background-color: transparent;
      --color: var(--primary-hover);
    }
  }

  // Outline (secondary)
  button.outline.secondary,
  input[type="submit"].outline.secondary,
  input[type="button"].outline.secondary,
  input[type="reset"].outline.secondary,
  [role="button"].outline.secondary {
    --color: var(--secondary);

    &[aria-current],
    &:hover,
    &:active,
    &:focus {
      --color: var(--secondary-hover);
    }
  }

  // Outline (contrast)
  button.outline.contrast,
  input[type="submit"].outline.contrast,
  input[type="button"].outline.contrast,
  input[type="reset"].outline.contrast,
  [role="button"].outline.contrast {
    --color: var(--contrast);

    &[aria-current],
    &:hover,
    &:active,
    &:focus {
      --color: var(--contrast-hover);
    }
  }
}

@else {
  // Secondary button without .class
  input[type="reset"] {
    --background-color: var(--secondary);
    --border-color: var(--secondary);
    --color: var(--secondary-inverse);
    cursor: pointer;

    &[aria-current],
    &:hover,
    &:active,
    &:focus {
      --background-color: var(--secondary-hover);
      --border-color: var(--secondary-hover);
    }

    &:focus {
      --box-shadow: var(--button-hover-box-shadow, 0 0 0 rgba(0, 0, 0, 0)),
        0 0 0 var(--outline-width) var(--secondary-focus);
    }
  }
}

// Button [disabled]
// 1. Links without href are disabled by default
button[disabled],
input[type="submit"][disabled],
input[type="button"][disabled],
input[type="reset"][disabled],
a[role="button"]:not([href]), // 1
[role="button"][disabled] {
  opacity: 0.5;
  pointer-events: none;
}