.btn_video{background-color: #decb93;color: #fff;}
.btn_video:hover{background-color: #cda851;color: #fff;}
.btn_video:active{background-color: #90772d;color: #fff;border:1px solid #fdf7e7;}
.btn_video:focus{color: #fff;}
hover:當鼠標移動到按鈕上觸發
active;按下
focus:獲取焦點時觸發