/* 圓形按鈕 */
button {
border-radius: 50%;
width: 100px;
height: 100px;
}
/* 寬度與高度相等的方形按鈕 */
button {
width: 100px;
height: 100px;
}
/* 長方形按鈕 */
button {
width: 150px;
height: 70px;
}
/* 斜角按鈕 */
button {
clip-path: polygon(0% 0%, 100% 0%, 100% 90%, 0% 100%);
}