old-website/static/css/_aside.scss

@mixin aside-item($color) {
    background-color: rgba($color, 0.1);
    border: 1px solid rgba($color, 0.5);
    color: $color;
}

.aside {
    margin: 0;
    padding: 0;

    background-color: $black;

    box-sizing: border-box;

    hr {
        margin: 0.5rem 0;
        padding: 0;

        width: 100%;
        height: 1px;

        background-color: $white;
        border: none;
    }

    br {
        margin: 0.5rem 0;
        padding: 0;
    }
}
.aside-container {
    margin: 0;
    padding: 1rem;

    position: sticky;
    top: 0;

    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.aside-item {
    margin: 0;
    padding: 0.75rem;

    width: 100%;
    height: auto;

    background-color: transparent;
    color: $white;

    text-decoration: none;

    display: flex;
    align-items: center;
    gap: 0.5rem;

    border: 1px solid transparent;
    border-radius: 3px;

    transition: all 0.2s ease-in-out;
    cursor: pointer;

    i {
        opacity: 0;
        transform: translateX(1rem);
        transition: all 0.2s ease-in-out;
        filter: blur(0.1rem);

        pointer-events: none;
    }

    &:hover i {
        opacity: 1;
        transform: translateX(0);
        filter: blur(0);
    }
}
.aside-red {
    @include aside-item($red);
}
.aside-yellow {
    @include aside-item($yellow);
}
.aside-green {
    @include aside-item($green);
}
.aside-blue {
    @include aside-item($blue);
}
.aside-purple {
    @include aside-item($purple);
}

@media screen and (max-width: 768px) {
    .aside {
        display: block;

        position: fixed;
        top: 3rem;
        left: -100vw;

        width: calc(100vw - 1rem);
        height: calc(100vh - 3rem);

        z-index: 68;
        overflow-y: auto;

        box-shadow: 0 0 0.5rem 5px rgba($black, 0.5);

        transition: left 0.2s ease-in-out, opacity 0.2s ease-in-out;
    }

    .aside-active {
        opacity: 1;
        left: 0;
    }
}