KNACSS/sass/components/_forms.scss

/* ----------------------------- */
/* ==Forms styling               */
/* ----------------------------- */

[type="color"],
[type="date"],
[type="datetime-local"],
[type="email"],
[type="month"],
[type="number"],
[type="password"],
[type="search"],
[type="submit"],
[type="tel"],
[type="text"],
[type="time"],
[type="url"],
[type="week"],
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  border: 0;
  box-shadow: 0 0 0 1px $forms-color inset;
  color: $color-base;
  vertical-align: middle;
  padding: $spacer-tiny $spacer-small;
  margin: 0;
  transition: 0.25s;
  transition-property: box-shadow, background-color, color, border;
  appearance: none;
}

[type="submit"] {
  background-color: $forms-color;
  color: $white;
  cursor: pointer;
}

input[readonly] {
  background-color: $color-muted;
}

select {
  padding-right: 2rem;
  border-radius: $border-radius;
  background-image: url("data:image/svg+xml,%3C%3Fxml%20version%3D%221.0%22%20standalone%3D%22no%22%3F%3E%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20xmlns%3Axlink%3D%22http%3A//www.w3.org/1999/xlink%22%20style%3D%22isolation%3Aisolate%22%20viewBox%3D%220%200%2020%2020%22%20width%3D%2220%22%20height%3D%2220%22%3E%3Cpath%20d%3D%22%20M%209.96%2011.966%20L%203.523%205.589%20C%202.464%204.627%200.495%206.842%201.505%207.771%20L%201.505%207.771%20L%208.494%2014.763%20C%209.138%2015.35%2010.655%2015.369%2011.29%2014.763%20L%2011.29%2014.763%20L%2018.49%207.771%20C%2019.557%206.752%2017.364%204.68%2016.262%205.725%20L%2016.262%205.725%20L%209.96%2011.966%20Z%20%22%20fill%3D%22inherit%22/%3E%3C/svg%3E");
  background-position: right .6rem center;
  background-repeat: no-repeat;
  background-size: 1.2rem;
}

/* hiding IE11 arrow */
select::-ms-expand {
  display: none;
}

textarea {
  min-height: 5em;
  vertical-align: top;
  resize: vertical;
  white-space: pre-wrap;
}

/* 'x' appears on right of search input when text is entered. This removes it */
[type="search"] {
  &::-webkit-search-decoration,
  &::-webkit-search-cancel-button,
  &::-webkit-search-results-button,
  &::-webkit-search-results-decoration {
    display: none;
  }
}

::-webkit-input-placeholder {
  color: #777;
}

input:-moz-placeholder,
textarea:-moz-placeholder {
  color: #777;
}

input::placeholder,
textarea::placeholder {
  color: #777;
}