@import url('https://fonts.googleapis.com/css?family=Open+Sans&display=swap');
body{
    font-family: 'Open Sans',sans-serif;
    background: #2c3e50

}
nav{
 
    position: sticky;
    top: 0px;
    /* margin: 230px auto 0; */
    
    width: 590px;
    height: 50px;
    background: #4675a3;
    border-radius: 15px;
    font-size: 0;
    box-shadow: 0 5px 5px rgba(0, 0, 0, 1);
    background-color: rgba(255, 255 ,255 , 0.3);
    backdrop-filter: blur(2px);
}
nav a{
    
    font-size: 15px;
    text-transform: uppercase;
    color: rgb(255, 255, 255);
    text-decoration: none;
    z-index: 1;
    line-height: 50px;
    position: relative;
    display: inline-block;
    text-align: center;
}
nav .animation{
    position: absolute;
    height: 50px;
    top: 0;
    z-index: 0;
    background: #21b9d4;
    border-radius: 15px;
    transition: all .4s ease 0s;
    

}
nav a:nth-child(1){
    width: 100px;

}
nav .start-home, a:nth-child(1):hover~.animation{
    width: 100px;
    left: 0;
}
nav a:nth-child(2){
    width: 110px;

}
nav a:nth-child(2):hover~.animation{
    width: 110px;
    left: 100px;

}
nav a:nth-child(3){
    width: 100px;

}
nav a:nth-child(3):hover~.animation{
    width: 110px;
    left: 210px;

}
nav a:nth-child(4){
    width: 140px;

}
nav a:nth-child(4):hover~.animation{
    width: 160px;
    left: 300px;

}
nav a:nth-child(5){
    width: 130px;

}
nav a:nth-child(5):hover~.animation{
    width: 140px;
    left: 450px;

}