simple-sidebar.css

*{
    margin: 0;
    padding: 0;
}

:root{
    --shadow:rgba(0,0,0,.3) 1px 1px 1px 1px;
    
}

body{
    color: #333;
    background-color: #fff;
    font-family: 'Open Sans', sans-serif;
}

header{
    text-align: center;
    background-color: #ac5358;
    color:rgba(255, 255, 255);
    padding: 20px 0;
    box-shadow: var(--shadow);
}

main{
    width: 75%;
    margin: 50px auto;
    line-height: 1.5em;
}

main h2{
    text-align: center;
    margin: 20px;
}

main section{
    margin: 20px 0;
    background-color: #ccc;
    padding: 20px 30px;
    box-shadow: var(--shadow);
    color: #333;
}

main p {
    margin: 10px 0;
}

.writer{
    text-align: right;
    font-style: italic;
    font-size: 95%;
}


#slider{
    color:#fff;
    text-align: center;
    margin: 60px;
}

#slider h1{
    margin:20px;
    border: 2px solid #fff;
    padding: 5px;
    transform: scale(1.3,1.3);
}

nav{
    position: fixed;
    top:0;
    left:-250px;
    z-index: 1000;
    background-color: rgba(51, 51, 51, 0.98);
    height: 100vh;
    width: 250px;
    display: inline-block;
    color:#fff;
    transition: all 400ms ease-in-out;
}

nav a{
    text-decoration: none;
    color:#fff;
}

nav ul{
    list-style: none;
}

nav li{
    line-height: 3em;
   
}

nav a{
    display: block;
    width:100%;
    height: 100%;
    border-bottom: 1px solid #fff;
}

nav a:hover{
    color:#999;
    border-bottom: 1px solid #999;
}

#cross{
    position: absolute;
    top:0;
    right: 0;
    padding: 15px;
    transform: scale(1.2,1);
    cursor: pointer;
}

#toggle{
    position: absolute;
    left:0;
    top:0;
    margin: 20px 10px;
    width: 30px;
    height: 30px;
    z-index: 100;
    background-image: url("../images/simple-sidebar/nav.png");
    background-position: center;
    background-size: cover;
    cursor: pointer;
    transition: opacity 400ms ease-in-out;
}

.remove{
    opacity: 0;
}

@media(min-width:850px){
    main{
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        justify-content: space-between;
        grid-gap: 10px;
    }
}