#b1{
    background-color: #ff0000;
    width: 100vw; 
    height: 25vh;
}

ul,li{
    list-style: none;
}


a{
    text-decoration: none;
    color: rgb(98, 179, 250);
    display: block;
    margin: 20px;
    font-size: 30px;
    float: left;
    background-color: #000000;
}

#b2{
    background-color: #2bff00;
    width: 70%;
    height: 50vh;
    float: left;
}

#b3{
    background-color: #004cff;
    width: 30%;
    height: 50vh;
    float: left;

}

#b4{
    background-color: #ff0000;
    width: 100vw;
    height: 25vh;
    float: left;
}

 
a:hover{
    background-color: #27b0ff;
    transition: all 3s;
}