ducha-qianduan/public/assets/libs/bootstrap-select/sass/variables.scss

$color-red-error: rgb(185, 74, 72);
$color-grey-arrow: rgba(204, 204, 204, 0.2);

$width-default: 220px; // 3 960px-grid columns

$zindex-select-dropdown: 1060; // must be higher than a modal background (1050)

//** Placeholder text color
$input-color-placeholder: #999;