div边框样式设置
div{
width: 400px;
height: 350px;
margin: 200px auto;
background: linear-gradient(to bottom,rgb(255,85,45),rgb(23,62,129));/*背景渐变*/
border-radius: 10px;/*圆角*/
text-align: center;
font-size: 12px;
border: 1px dashed #000;/*边框虚线*/
box-shadow: 0px 6px 40px #ccc inset; /*内阴影*/
}