CSS/border

border-style:dotted;

border-style:dashed;

border-style:solid;

border-style:double;

border-style:groove;

border-style:ridge;

border-style:inset;

border-style:outset;

border-color: 色を指定;
border-top-color: 上の色を指定;
border-width: 太さを指定;
border-left-width: 左の太さを指定;