cssOMS/layout.scss

@import "color";

#nav-side {
    width: 175px;
    position: fixed;
    top: 75px;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 0;
    overflow-y: auto;
    font-size: 0.8em;

    background: #2F2F2F;

    input {
        display: none;
    }

    input + ul {
        .max {
            display: none;
        }

        .min {
            display: inherit;
        }

        > li:nth-child(n+2) {
            display: none;
        }
    }

    input:checked + ul {
        .max {
            display: inherit;
        }

        .min {
            display: none;
        }

        > li:nth-child(n+2) {
            display: inherit;
        }
    }

    > li {
        li {
            border-top: 1px solid #3f3f3f;
            border-bottom: 1px solid #1a1a1a;
            color: #fff;

            &:first-child {
                padding: 5px 0 5px 5px;
            }

            a {
                display: block;
                padding: 5px 0 5px 5px;

                &:hover {
                    background: #3F3F3F;
                }
            }
        }
    }

    li:last-child li:last-child {
        border-bottom: none;
    }

    .max, .min {
        float: right;
    }

    i {
        margin-right: 5px;
    }
}

main {
    height: 100%;
    width: 100%;
    position: relative;
    top: 0;
    bottom: 100%;
    left: 0;
    z-index: 1;

    padding-right: 5px;

    background: $background-color;
    transition: all 0.2s;
}

.nav-trigger {
    position: absolute;
    clip: rect(0, 0, 0, 0);
}

label[for="nav-trigger"] {
    font-size: 2.0em;
    height: 30px;
    width: 30px;
    cursor: pointer;
}

.nav-trigger:checked ~ main {
    width: calc(100% - 175px);
    left: 175px;
    box-shadow: -3px 3px 5px 0 rgba(0, 0, 0, 0.5);
}