*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.top{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 50%;
    transition: all 1s;
    min-width: 50%;
}
.top button{
    border: #666 solid 5px;
    min-height: 30rem;
    min-width: 30rem;
    border-radius: 50%;
    font-size: 69px;
    filter: drop-shadow(10px 8px 6px #111);
    background: #999;
    color: #fff;
    transition: all 1s;
    cursor: pointer;
}
.top button:hover{
    min-height: 50rem;
    min-width: 50rem;
    border: darkred solid 5px;
    background: red;
    font-size: 127px;
    transition: all 1s;
}