Pure css sidebar layout - less

main.less

@import "./pure-min.css";
@import "./side-menu.less";

side-menu.less

.pure-img-responsive {
    max-width: 100%;
    height: auto;
}
#layout, #menu, .menu-link {
    -webkit-transition: all 0.1s ease-out;
    -moz-transition: all 0.1s ease-out;
    -ms-transition: all 0.1s ease-out;
    -o-transition: all 0.1s ease-out;
    transition: all 0.1s ease-out;
}

@menuwidth: 177px;

#layout {
    position: relative;
    padding-left: 0;
    .active {
        position: relative;
        left: @menuwidth;
        #menu {
            left: @menuwidth;
            width: @menuwidth;
        }
        .menu-link {
            left: @menuwidth;
        }
    }
}

.content {
    margin: 0 auto;
    padding: 0 2em;
    max-width: 800px;
    margin-bottom: 50px;
    line-height: 1.6em;
}

.header {
     margin: 0;
     color: #333;
     text-align: center;
     padding: 2.5em 2em 0;
     border-bottom: 1px solid #eee;
 }
    .header h1 {
        margin: 0.2em 0;
        font-size: 3em;
        font-weight: 300;
    }
     .header h2 {
        font-weight: 300;
        color: #ccc;
        padding: 0;
        margin-top: 0;
    }

.content-subhead {
    margin: 50px 0 20px 0;
    font-weight: 300;
    color: #888;
}



#menu {
    margin-left: -@menuwidth; /* "#menu" width */
    width: @menuwidth;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1000; /* so the menu or its navicon stays above all content */
    background: #191818;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;

     a {
        color: #999;
        border: none;
        padding: 0.6em 0 0.6em 0.6em;
    }

     .pure-menu, .pure-menu ul {
        border: none;
        background: transparent;
    }

    .pure-menu ul, .pure-menu .menu-item-divided {
        border-top: 1px solid #333;
        li a:hover,
        li a:focus {
            background: #333;
        }
    }

    .pure-menu-selected, .pure-menu-heading {
        background: #1f8dd6;
        a {
            color: #fff;
        }
    }

    .pure-menu-heading {
        font-size: 110%;
        color: #fff;
        margin: 0;
    }
}

.menu-link {
    position: fixed;
    display: block; /* show this only on small screens */
    top: 0;
    left: 0; /* "#menu width" */
    background: #000;
    background: rgba(0,0,0,0.7);
    font-size: 10px; /* change this value to increase/decrease button size */
    z-index: 10;
    width: 2em;
    height: auto;
    padding: 2.1em 1.6em;
    &:hover,
    &:focus {
        background: #000;
    }
    span {
        position: relative;
        display: block;
    }
    span,
    span:before,
    span:after {
        background-color: #fff;
        width: 100%;
        height: 0.2em;
    }
    span:before,
    span:after {
        position: absolute;
        margin-top: -0.6em;
        content: " ";
    }
    span:after {
        margin-top: 0.6em;
    }
}






@media (min-width: 48em) {

    .header,
    .content {
        padding-left: 2em;
        padding-right: 2em;
    }

    #layout {
        padding-left: @menuwidth; /* left col width "#menu" */
        left: 0;
    }
    #menu {
        left: @menuwidth;
    }

    .menu-link {
        position: fixed;
        left: @menuwidth;
        display: none;
    }

    #layout.active .menu-link {
        left: @menuwidth;
    }
}