input.button2_midle1 {
    display: inline-block;
    text-shadow: 1px 1px #fff;
    font-size: 16px;
    font-weight: 800;
    text-decoration: none;
    padding: .1em 0.4em;
    border: 1px solid #aaa;
    border-radius: 5px;
    outline: none;
    background: #dedada;
    background-size: 1px 100%, 1px 100%, auto auto;
    overflow: hidden;
}

    input.button2_midle1:after {
        /*content: "\bb";*/
        position: relative;
        bottom: 0;
        display: inline-block;
        margin-left: 1em;
        vertical-align: middle;
        font-family: "Times","Times New Roman","serif","sans-serif","EmojiSymbols";
        font-weight: 500;
        font-size: 100%;
        -webkit-transform: rotate(90deg);
        transform: rotate(90deg);
    }

    input.button2_midle1:hover {
        background-color: #4cff00;
    }