ul.date_select {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

ul.date_select > li {
    width: calc(33% - 10px);
}

ul.date_select select {
    width: calc(100% - 2em);
    height: 40px;
    margin: 0;
    padding: 10px;
    background: #fff;
    border: solid 1px #E35577;
    border-radius: 0;
    outline: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    font-size: 15px;
    position: relative;    
}