*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body{
    font-family: sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

#navigation{
    background-color: wheat;
    padding: 20px;
    width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.5);
    transition: width 0.6s linear;
}

#navigation.active{
    width: 400px;
}

ul{
    display: flex;
    list-style-type: none;
    padding: 0;
    margin: 0;
    width: 0;
    transition: width 0.6s linear;
}

nav.active ul{
    width: 100%;
}

nav ul li{
    transform: rotate(0deg);
    opacity: 0;
    transition: transform 0.6s linear, opacity 0.6s linear;
}

nav.active ul li{
    opacity: 1;
    transform: rotateY(360deg);
}
nav ul a{
    position: relative;
    color: #000;
    text-decoration: none;
    margin: 0 10px;
}

.icon{
    background-color: wheat;
    border: 0;
    cursor: pointer;
    padding: 0;
    position: relative;
    height: 30px;
    width: 30px;
    outline: none;
}

.icon .line{
    background-color: blue;
    height: 2px;
    width: 20px;
    position: absolute;
    top:10px;
    left: 5px;
    transition: transform 0.6s linear;
}

.icon .line2{
    top:auto;
    bottom: 10px;
}

nav.active .icon .line1{
    transform: rotate(-765deg) translateY(5.5px);
}

nav.active .icon .line2{
    transform: rotate(765deg) translateY(-5.5px);
}