picocss/scss/content/_form.scss

/**
 * Form elements
 */


// 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
input,
optgroup,
select,
textarea {
  margin: 0; // 2
  font-family: inherit; // 1
  font-size: 1rem; // 1
  letter-spacing: inherit; // 2
  line-height: var(--line-height); // 1
}

// Show the overflow in IE.
input {
  overflow: visible;
}

// Remove the inheritance of text transform in Edge, Firefox, and IE
select {
  text-transform: none;
}

// 1. Correct the text wrapping in Edge and IE
// 2. Correct the color inheritance from `fieldset` elements in IE
// 3. Remove the padding so developers are not caught out when they zero out
// `fieldset` elements in all browsers
legend {
  max-width: 100%; // 1
  padding: 0; // 3
  color: inherit; // 2
  white-space: normal; // 1
}

// 1. Remove the margin in Firefox and Safari
// 2. Remove the default vertical scrollbar in IE
// 3. Change the resize direction in all browsers (opinionated)
textarea {
  margin: 0; // 1
  overflow: auto; // 2
  resize: vertical; // 3
  resize: block; // 3
}

// Remove the padding in IE 10
[type="checkbox"],
[type="radio"] {
  padding: 0;
}

// Correct the cursor style of increment and decrement buttons in Safari
::-webkit-inner-spin-button,
::-webkit-outer-spin-button {
  height: auto;
}

// 1. Correct the odd appearance in Chrome and Safari
// 2. Correct the outline style in Safari
[type="search"] {
  -webkit-appearance: textfield; // 1
  outline-offset: -2px; // 2
}

// Remove the inner padding in Chrome and Safari on macOS
[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

// 1. Correct the inability to style clickable types in iOS and Safari
// 2. Change font properties to `inherit` in Safari
::-webkit-file-upload-button {
  -webkit-appearance: button; // 1
  font: inherit; // 2
}

// Remove the inner border and padding of focus outlines in Firefox
::-moz-focus-inner {
  padding: 0;
  border-style: none;
}

//  Restore the focus outline styles unset by the previous rule in Firefox
:-moz-focusring {
  outline: 1px dotted ButtonText;
}

// Remove the additional :invalid styles in Firefox
:-moz-ui-invalid {
  box-shadow: none;
}

// Change the inconsistent appearance in IE (opinionated)
::-ms-expand {
  display: none;
}

// Remove the border and padding in all browsers (opinionated)
[type="file"],
[type="range"] {
  padding: 0;
  border-width: 0;
}


// Pico
// ––––––––––––––––––––

// Force height for alternatives input types
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]) {
  height: calc(
    (1rem * var(--line-height)) +
    (var(--form-element-spacing-vertical) * 2) +
    (var(--form-element-border-width) * 2)
  );
}

// Fieldset
fieldset {
  margin: 0;
  margin-bottom: var(--spacing-typography);
  padding: 0;
  border: 0;
}

// Label & legend
label,
fieldset legend {
  display: block;
  margin-bottom: var(--spacing-form-element);
  vertical-align: middle;
}

// Global layout
input:not([type="checkbox"]):not([type="radio"]),
select,
textarea,
form small {
  display: block;
  width: 100%;
}

// Reset appearance (Not Checkboxes, Radios, Range and File)
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="file"]),
select,
textarea {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  padding: var(--form-element-spacing-vertical) var(--form-element-spacing-horizontal);
  vertical-align: middle;
}

// Commons styles
input,
select,
textarea {
  border: var(--form-element-border-width) solid var(--input-border);
  border-radius: var(--block-round);
  outline: none;
  background-color: var(--input-background);
  color: var(--text);
  font-weight: var(--form-element-weight);


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

  &::placeholder,
  &::-webkit-input-placeholder {
    color: var(--muted-text);
    opacity: 1;
  }

  &:active,
  &:focus {
    border-color: var(--input-hover-border);
    background-color: var(--input-hover-background);
  }

  &[readonly],
  &[disabled] {
    border-color: var(--muted-border);
    box-shadow: none;

    & ~ label {
      color: var(--muted-text);
    }

    &:active,
    &:focus {
      @if $enable-important {
        box-shadow: none !important;
      }
      @else {
        box-shadow: none;
      }
    }
  }

  &[disabled]:not([type="reset"]):not([type="submit"]):not([type="button"]) {
    background-color: var(--muted-background);
  }

  &[disabled] {
    opacity: .66;
  }

  // Validation states
  @if $enable-input-states and $enable-classes {

    // Validation states
    &.valid,
    &.invalid {
      padding-right: 2rem;
      background-position: center right .75rem;
      background-repeat: no-repeat;
      background-size: 1rem auto;
    }

    &.valid {
      background-image: var(--icon-valid);
    }

    &.invalid {
      background-image: var(--icon-invalid);
    }
  }
}

// Margin bottom (Not Checkboxes andRadios)
input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
  margin-bottom: var(--spacing-typography);
}

// Focus styles (Not Range and File)
input:not([type="range"]):not([type="file"]),
select,
textarea {
  &:focus  {
    box-shadow: 0 0 0 var(--form-element-outline-width) var(--input-focus);
 }
}

// Select
select {

  // Unstyle the caret on `<select>`s in IE10+.
  &::-ms-expand {
    border: 0;
    background-color: transparent;
  }

  &:not([multiple]):not([size]) {
    padding-right: calc(var(--form-element-spacing-horizontal) + 1.5rem);
    background-image: var(--icon-chevron);
    background-position: center right .75rem;
    background-repeat: no-repeat;
    background-size: 1rem auto;
  }
}

// Helper
form small {
  color: var(--muted-text);
}

input,
select,
textarea {
  + small {
    margin-top: calc(var(--spacing-typography) * -0.5);
    margin-bottom: var(--spacing-typography);
  }
}

// Styles for Input inside a label
label {
  & > input,
  & > select,
  & > textarea {
    margin-top: var(--spacing-form-element);
  }
}