.mySelect{
    width: 300px;
    height:30px;
    margin-left: -20px;
    margin-top: -10px;
}
.mySelect .bootstrap-select.open > .dropdown-menu {
    /*display: block;*/
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    -webkit-transform: scale(1) translateY(0);
    -ms-transform: scale(1) translateY(0);
    transform: scale(1) translateY(0);
    z-index: 1000;
}

.mySelect .bootstrap-select > .dropdown-menu {
    /*display: none;*/
    opacity: 0;
    max-height: 330px !important;
    visibility: hidden;
    overflow: hidden;
    -webkit-transform-origin: 50% 0;
    -ms-transform-origin: 50% 0;
    transform-origin: 50% 0;
    -webkit-transform: scale(0.85) translateY(-5px);
    -ms-transform: scale(0.85) translateY(-5px);
    transform: scale(0.85) translateY(-5px);
    -webkit-transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
    transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
}

.mySelect .dropdown-menu>.active>a, .dropdown-menu>.active>a:hover, .dropdown-menu>.active>a:focus {
    color: #fff;
    text-decoration: none;
    background-color: #428bca;
    outline: 0;
}

.mySelect .dropdown-menu>li>a {
    display: block;
    padding: 3px 20px;
    clear: both;
    font-weight: normal;
    line-height: 1.428571429;
    color: #333;
    white-space: nowrap;
}

.mySelect .dropdown-item:hover{
    background-color: #428bca; /* 鼠标悬停时的背景色 */
}

.mySelect .box {
    width: 500px;
    height: 20px;
    position: absolute;
    margin: auto;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
}

.mySelect h2 {
    text-align: center;
}

.mySelect .bootstrap-select:not([class*=col-]):not([class*=form-control]):not(.input-group-btn) {
    width: 30%;
}

.mySelect .bootstrap-select:not(.input-group-btn), .bootstrap-select[class*=col-] {
    float: none;
    display: block;
    margin-left: 0;
}

.mySelect .bootstrap-select:not(.input-group-btn), .bootstrap-select[class*=col-] {
    float: none;
    margin-left: 0;
}

.mySelect .bootstrap-select > .dropdown-toggle {
    background: #EDF2F5;
    border: 0;
    width: 100%;
    height: 35px;
    display: block;
    padding: 8px 15px;
    color: #000000;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.030em;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'Roboto', sans-serif;
}

.mySelect .bootstrap-select > .dropdown-toggle.bs-placeholder,
.mySelect .bootstrap-select > .dropdown-toggle.bs-placeholder:active,
.mySelect .bootstrap-select > .dropdown-toggle.bs-placeholder:focus,
.mySelect .bootstrap-select > .dropdown-toggle.bs-placeholder:hover {
    color: #000;
}

.mySelect .dropdown-toggle::after {
    content: "";
    position: absolute;
    border-top: .5em solid;
    border-right: .5em solid transparent;
    border-bottom: 0;
    border-left: .5em solid transparent;
    right: 10px;
    top: 48%;
}

.mySelect .dropdown-menu {
    box-shadow: 0px 0px 15px rgba(60, 76, 150, 0.1);
    -webkit-box-shadow: 0px 0px 15px rgba(60, 76, 150, 0.1);
    -moz-box-shadow: 0px 0px 15px rgba(60, 76, 150, 0.1);
    position: absolute;
    left: 0;
    background: #fff;
    min-width: 100% !important;
    width: 100% !important;
}

.mySelect .bootstrap-select .dropdown-menu a {
    display: block;
    padding: 2px 10px;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.030em;
}