ionic-framework/ionic/components/text-input/text-input.scss

// Text Input
// --------------------------------------------------

$input-focus-border-color:      #51a7e8 !default;
$input-focus-box-shadow:        inset 0px 0px 8px 0px $input-focus-border-color !default;

$text-input-background-color:   $list-background-color !default;


ion-input {

  // text inputs
  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: block;
    background: transparent;
    border: 0;
    width: 100%;
  }
}

ion-input.item {
  align-items: flex-start;
}

.key-input ion-input {

  &.has-focus {
    border-color: $input-focus-border-color;
    box-shadow: $input-focus-box-shadow;
  }

  :focus {
    outline: none;
  }
}

ion-input [text-input] {
  flex: 1;
  background-color: $text-input-background-color;
  pointer-events: none;
}

ion-input.has-focus [text-input] {
  pointer-events: auto;
}

ion-input textarea {
  padding-top: 9px;
}

textarea {
  margin: 0;
  padding: 0;
  height: auto;
  overflow: auto;
  font: inherit;
  color: inherit;
}

.platform-mobile textarea {
  resize: none;
}

input,
textarea {
  @include placeholder();
}