.subsection {
    padding: 0;
    margin: 0;
}

.subsection:target::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    margin-left: calc(-1 * var(--main_padding-left) / 2);
    border-left: thin solid green;
    /*animation: fadeout 0s forwards 0.75s;*/
}

@keyframes fadeout {
    to {
        opacity: 0;
    }
}