e1.css

*{
    box-sizing: border-box;
}
html{
    font-size: 14px;
    font-family: 'Courier New', Courier, monospace;
    overflow: hidden;
}

body{
    height: 100vh;
    background-color: rgb(0, 0, 0);
    
}

#fecha{
    width: 80%;
    margin: 0 auto;
    transform: translate(0%, 70%);
}
p{
    color: white;
    font-size:4rem;
    align-self: center;
}

ul{
    display: flex;
    flex-direction: row;
    margin: 0;
    padding:0;
    list-style: none;
    justify-content: center;
    border: 7px solid peachpuff;
    transition: border-color 2s;
    width: 80%;
    margin: 0 auto;
    /*box-shadow: 10px 10px 145px white;*/
    
}

li{
    padding: 1.5em;
    font-size: 4rem;
    font-weight: bolder;
    color: white;
    display: flex;
    align-items: center;
    
}

#day{
    color: white;
    width: 70%;
    margin: 0 auto;
    text-align: center;
    font-size: 3rem;
    margin-bottom: 1em;
    font-weight: 600;
}
@media screen and (max-width: 960px){
    ul{

    }
    li{
        font-size: 3rem;
    }

    #day{
        font-size: 3rem;
    }
}
@media screen and (max-width: 780px){

    #fecha{
        transform: translate(0, 20%);
    }

    ul{
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 50%;
    }
    li{
        font-size: 3rem;
        padding: 2rem;
    }

    #day{
        font-size: 2rem;
    }

    p{
        display: none;
    }
}