.arrow_box_01 {
    /* width: 150px; */
    height: 16px;
    border: 1px solid #F00;
    position: relative;
    margin-top: 30px;
    background-color: #fff;
}
.arrow_box_01-3 .triangle {
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid #F00;
    border-left: 10px solid transparent;
    position: absolute;
    top: -20px;
    left: 3px;
}
.arrow_box_01-3 .triangle:after {
    content: "";
    border-top: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #fff;
    border-left: 8px solid transparent;
    position: absolute;
    top: -6px;
    left: -8px;
}