*{
    box-sizing: border-box;
}
body{
    background-color: pink;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; 
    min-height: 100vh;
    margin: 0;
}
.countdown {
    display: flex;
}
.text{
    font-size: 6rem;
    line-height: 1;
    margin: 0 2rem;
    font-weight: bold;
}
.elem{
    text-align: center;
}
.elem>span{
    font-weight: 900    ;
}
h1{
    font-size : 5rem;
    margin-top: -10rem;
}
@media screen and (max-width:600px){
    .text{
    font-size: 35px;
    margin: 0 20px;
    }
    h1{
    font-size : 50px;
}
}
@media screen and (max-width:350px){
    .text{
    font-size: 20px;
    margin: 0 20px;
    }
    h1{
    font-size : 33px;
}
}