select {
    display: block;
    box-sizing: border-box;
    height: 30px;
    line-height: 30px;
    padding: 0 0 0 10px;
    border: 1px solid #008080;
    font-size: 1em;
    appearance: none;
    -moz-appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    /* ▲ */
    background-image: linear-gradient(45deg, transparent 50%, black 50%), linear-gradient(135deg, black 50%, transparent 50%), linear-gradient(to right, #cccccc, #cccccc);
    background-position: calc(100% - 20px) 50%, calc(100% - 12px) 50%, calc(100% - 40px) 50%;
/*    background-image: linear-gradient(45deg, transparent 48%, black 52%), linear-gradient(135deg, black 48%, transparent 52%), linear-gradient(to right, #cccccc, #cccccc);
    background-position: calc(100% - 18px) 50%, calc(100% - 10px) 50%, calc(100% - 40px) 50%;
*/    /* 縦線 */
    background-size: 8px 8px, 8px 8px, 1px 1.5em;
    background-repeat: no-repeat;
    background-clip: padding-box;
}

    /* フォーカス時（矢印赤） */
    select:focus {
        outline: 0;
        background-image: linear-gradient(45deg, red 50%, transparent 50%), linear-gradient(135deg, transparent 50%, red 50%), linear-gradient(to right, #cccccc, #cccccc);
        background-position: calc(100% - 12px) 50%, calc(100% - 20px) 50%, calc(100% - 40px) 50%;
    }

    /* Firefox用補正 */
    select:-moz-focusring {
        color: transparent;
        text-shadow: 0 0 0 #000000;
    }

    /* IE Edge用 */
    select::-ms-expand {
        display: none;
    }

    /* hoverスムーズ効果 */
    select:enabled:hover {
        background-color: #EEEEEE;
    }

    /* disabled時 */
    select:disabled {
        color: #999;
        background-color: #eee;
        border-color: #ccc;
        cursor: default;
    }