🔥CSSで中央のコンテンツを水平方向と垂直方向に3つの方法✨

.classic{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}

.grid{
    display: grid;
    place-items: center;
}

.flexbox{
    display: flex;
    align-items: center;
    justify-content: center;
}