body {
    padding: 0;
    margin: 0;
}
* { box-sizing: border-box; }
a { text-decoration: none; }
a:hover { text-decoration: none; }
ul { list-style: none}
li { list-style: none}


/* ASIDE */
aside nav a {
    position: relative;
    padding-left: 4px;
    display: block;
}
aside nav a:not(.collapsed) {
    background: var(--color-lightblue);
}
aside nav a:not(.collapsed)::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--color-main);
}
aside nav a.collapsed::before {
    display: none;
}