ionic-framework/scss/ionic/_form.scss

// Forms
// -------------------------------

// Make all forms have space below them
form {
  margin: 0 0 $line-height-base;
}

// Groups of fields with labels on top (legends)
legend {
  display: block;
  margin-bottom: $line-height-base;
  padding: 0;
  width: 100%;
  border: 0;
  border-bottom: 1px solid #e5e5e5;
  color: $gray-dark;
  font-size: $font-size-base * 1.5;
  line-height: $line-height-base * 2;

  // Small
  small {
    color: $gray-light;
    font-size: $line-height-base * .75;
  }
}

// Set font for forms
label,
input,
button,
select,
textarea {
  @include font-shorthand($font-size-base, normal, $line-height-base); // Set size, weight, line-height here
}
input,
button,
select,
textarea {
  font-family: $base-font-family; // And only set font-family here for those that need it (note the missing label element)
}


// Input groups
// -------------------------------

.input-group {
  display: block;
  overflow: hidden;
  border-top: $input-border-width solid $input-border-color;
  border-bottom: $input-border-width solid $input-border-color;
  background-color: $input-bg;
}
.padded > .input-group,
.input-group.margin {
  @include border-radius($input-border-radius);
  border-right: $input-border-width solid $input-border-color;
  border-left: $input-border-width solid $input-border-color;
}

.input-group .input-row + .input-row {
  border-top: $input-border-width solid $input-border-color;
}

.input-group + .input-group {
  margin-top: $content-padding;
}

.input-row {
  position: relative;
  display: -webkit-flex;
  display: flex;
  overflow: hidden;
  padding: 6px 8px 5px;

  input {
    @include border-radius(0);
    margin: 0;
    background-color: transparent;
    flex: 1 0 220px;
    -webkit-appearance: none;
  }

  .input-label {
    padding: 7px 10px 7px 3px;
    max-width: 200px;
    color: $input-label-color;
    font-weight: bold;
    flex: 1 0 100px;
  }
  [class^="icon-"], [class*=" icon-"] {
    display: inline-block;
    text-align: center;
    font-size: 16px;
    flex: 0 0 24px;
    align-self: center;
  }
  .placeholder-icon {
    color: #999;
  }
}

.input-group.stacked-label,
.input-group.stacked-label .input-row {
  display: block;
  border: 0;
  background-color: transparent;

  .input-label, [class^="icon-"], [class*=" icon-"] {
    display: inline-block;
    padding: 4px 0;
    vertical-align: middle;
  }
}

.input-group.stacked-label input,
.input-group.stacked-label textarea
{
  @include border-radius($input-border-radius);
  overflow: hidden;
  padding: 4px 8px 3px;
  border: $input-border-width solid $input-border-color;
  background-color: $input-bg; 
}
.input-group.stacked-label input {
  height: $line-height-computed + $font-size-base + 12px;
}


// Form Controls
// -------------------------------

// Shared size and type resets
select,
textarea,
input[type="text"],
input[type="password"],
input[type="datetime"],
input[type="datetime-local"],
input[type="date"],
input[type="month"],
input[type="time"],
input[type="week"],
input[type="number"],
input[type="email"],
input[type="url"],
input[type="search"],
input[type="tel"],
input[type="color"] {
  display: inline-block;
  height: $line-height-computed + $font-size-base;
  color: $gray;
  vertical-align: middle;
  font-size: $font-size-base;
  line-height: $line-height-computed;
}

input,
textarea {
  width: 100%;
}

// Reset height since textareas have rows
textarea {
  height: auto;
}

// Everything else
textarea,
input[type="text"],
input[type="password"],
input[type="datetime"],
input[type="datetime-local"],
input[type="date"],
input[type="month"],
input[type="time"],
input[type="week"],
input[type="number"],
input[type="email"],
input[type="url"],
input[type="search"],
input[type="tel"],
input[type="color"] {
  border: 0;
}

// Position radios and checkboxes better
input[type="radio"],
input[type="checkbox"] {
  margin: 0;
  line-height: normal;
}

// Reset width of input images, buttons, radios, checkboxes
input[type="file"],
input[type="image"],
input[type="submit"],
input[type="reset"],
input[type="button"],
input[type="radio"],
input[type="checkbox"] {
  width: auto; // Override of generic input selector
}

// Set the height of select and file controls to match text inputs
select,
input[type="file"] {
  line-height: $input-height-base;
}

// Make select elements obey height by applying a border
select {
  border: $input-border-width solid $input-border-color;
  background-color: $input-bg; // Chrome on Linux and Mobile Safari need background-color
}

// Make multiple select elements height not fixed
select[multiple],
select[size] {
  height: auto;
}


// Placeholder
// -------------------------------
input,
textarea {
  @include placeholder();
}


// DISABLED STATE
// -------------------------------

// Disabled and read-only inputs
input[disabled],
select[disabled],
textarea[disabled],
input[readonly],
select[readonly],
textarea[readonly] {
  background-color: $input-bg-disabled;
  cursor: not-allowed;
}
// Explicitly reset the colors here
input[type="radio"][disabled],
input[type="checkbox"][disabled],
input[type="radio"][readonly],
input[type="checkbox"][readonly] {
  background-color: transparent;
}