* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    list-style: none;
    text-decoration: none;
}

.menu {
    width: 300px;
    overflow: hidden;
}

.item {
    border-top: 1px solid #EB0029;
    overflow: hidden;
}

.acor {
    display: block;
    padding: 16px 20px;
    background: #EB0029;
    color: white;
    position: relative;
}

    .acor:before {
        content: "";
        position: absolute;
        width: 14px;
        height: 14px;
        background: #EB0029;
        left: 20px;
        bottom: -7px;
        transform: rotate(45deg);
    }

    .acor i {
        margin-right: 10px;
    }

.smenu {
    background: white;
    overflow: hidden;
    transition: max-height 0.3s;
    max-height: 0;
}

    .smenu a {
        display: block;
        padding: 16px 26px;
        color: black;
        font-size: 14px;
        margin: 4px 0;
        position: relative;
    }

        .smenu a:before {
            content: "";
            position: absolute;
            width: 6px;
            height: 100%;
            background: #EB0029;
            left: 0;
            top: 0;
            transition: 0.3s;
            opacity: 0;
        }

        .smenu a:hover:before {
            opacity: 1;
        }

.item:target .smenu {
    max-height: 10em;
}