使用css3实现一个大白的特效

"```markdown

@keyframes bigWhite {
    0% {
        transform: scale(1);
        background-color: white;
    }
    50% {
        transform: scale(1.1);
        background-color: #f0f0f0;
    }
    100% {
        transform: scale(1);
        background-color: white;
    }
}
.white-box {
    width: 200px;
    height: 200px;
    background-color: white;
    border: 2px solid black;
    animation: bigWhite 3s infinite;
}