style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    --bg-color:rgb(117, 104, 230);
}
body{
    background-color: var(--bg-color);
}
h1{
    font-size: 64px;
}
article{
    height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    gap:25px;
    align-items: center;
    justify-content: center;
}
section{
    background-color: #fff;
    padding: 25px;
    border-radius: 5px;
}
section>div{
    display: flex;
    justify-content: center;
    gap:5px;
    padding: 25px;
}
.btn{
    background-color: #00000000;
    border:2px solid var(--bg-color);
    padding: 5px 12px;
    border-radius: 5px;
    font-size: 18px;
    outline: none;
    margin: 0 10px;
    font-weight: bold;
    color: #333;
    transition: all .25s ease-in-out;
}
.btn:hover{
    background-color: var(--bg-color);
    color:#fff;
}