A.opacity B.border C.font-weight D.background-color
A.!h1{color:red;width:100px;height:110px;} B.#h1{color:red;width:100px;height:110px;} C.h1{color:red;width:100px;height:110px;} D..h1{color:red;width:100px;height:110px;}
A.border-radius:20px40px60px; B.border-radius:20px60px40px40px; C.border-radius:20px60px40px; D.border-radius:20px40px60px40px;