@media screen and (max-width: 1024px) {
    .container-secondary .btn{
        margin-top: 0;
    }
}
@media screen and (max-width: 800px) {
    .nav{
        display: flex;
        flex-direction: column;
    }
    h1{
        font-size: 35px;
    }
    button{
        margin-top: 20px;
    }
}
@media screen and (max-width: 600px){
    .clock{
        height:350px ;
        width: 350px;
    }
    .datetime{
        width: 380px;
    }
    .date{
        font-size: 18px;
    }
    .time{
        font-size: 50px;
    }
   

}
@media screen and (max-width: 540px){
    h1{
        font-size: 30px;
    }
    .datetime{
        width: 350px;
    }
    .clock{
        height:330px ;
        width: 330px;
    }
    .date{
        font-size: 16px;
    }
    .time{
        font-size: 45px;
    }
}