已有CSS：

h2 {
    font-size: 52px;
    font-weight: bold;
    color: #000;
}
p {
    font-size: 12px;
    color: #333;
}

你的CSS

IPHONE XR
IS THE FUCKING
BEST EVER MADE

iPhone XR has not been authorized as required by the rules of the Federal Communications Commission. iPhone XR is not, and may not be, offered for sale or lease, or sold or leased, until authorization is obtained.

改变H2字号大小查看动态变化：