*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,body{
    height: 100%;
    width: 100%;
}
.grid-container{
    display:grid;
    grid-template-columns: repeat(auto-fit,minmax(300px,1fr));
    grid-auto-rows: 250px;
    align-items: center;
    justify-items: center;
}
#b1{
    padding: 20px 70px;
    border-radius: 45px;
    background-color: pink;
    border: 2px solid rgb(255, 154, 171);
    font-size: 20px;
    cursor: pointer;
    color: white;
}
#b1:hover{
    background-color: white;
    color: pink;
    transition: 0.2s;
}