body{
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none; 
}

#form{
    background-color: #47beec;
    width: 25%;
    margin: 20px auto;
    padding: 50px;
    box-shadow: 10px 10px 5px rgb(18, 38, 41);
    border-radius: 6px;
}

#btn{
    color: aliceblue;
    background-color: rgb(5, 138, 148);
    padding: 10px;
    font-size: large;
    border-radius: 10px;
}

@media screen and (max-width:500px) {
    #form{
        width: 65%;
        padding: 40px;
    }
}

.sidebar{
    position: fixed;
    left: -250px;
    width: 250px;
    height: 100%;
    background: #042331;
    transition: all .5s ease;
}

.sidebar header{
    font-size: 20px;
    color: antiquewhite;
    text-align: center;
    line-height: 70px;
    background: #063146;
    user-select: none;
}

.sidebar ul a{
    display: block;
    height: 100%;
    width: 100%;
    line-height: 65px;
    font-size: 12px;
    color: white;
    padding-left: 20px;
    box-sizing: border-box;
    border-top: 1px solid rgba(255,255,255,.1);
    border-bottom: 1px solid black;
    transition: .4s;
}

ul li:hover a{
    padding-left: 25px;
}

#check{
    display: none;
}
label #btn,label #cancel{
    position: absolute;
    cursor: pointer;
    background-color: #042331;
    border-radius: 3px;
}

label #btn{
    left: 40px;
    top: 25px;
    font-size: 35px;
    color: white;
    padding: 6px 12px;
    transition: all .5s ease;

}

label #cancel{
    z-index: 1111;
    left: -195px;
    top: 17px;
    color: #0a5275;
    padding: 4px 9px;
    transition: all .5s ease;
}

#check:checked ~ .sidebar{
    left: 0;
}

#check:checked ~ label #btn{
    left: 250px;
    opacity: 0;
    pointer-events: none;
}

#check:checked ~ label #cancel{
    left: 195px;
}

#check:checked ~ section{
    margin-left: 250px;
}