.underline_hover {
    display: inline-block;
    position: relative;
    color: #555;
    text-decoration: none;
}

.underline_hover:before {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 3px;
    background: rgb(78, 247, 69);
    /*↑ normal = 555*/
    transform: scale(0, 1);
    transition: 0.4s;
}

.underline_hover:hover:before {
    transform: scale(1);
}

.back-color-181 {
    background-color: #181a1b
}