border-width: 4px;
border-style: solid;
border-width: 4px;
border-style: dashed;
border-width: 4px;
border-style: dotted;
border-width: 4px;
border-style: groove;
border-width: 4px;
border-style: ridge;
border-width: 4px;
border-style: inset;
border-width: 4px;
border-style: outset;
border-width: 4px;
border-style: double dotted solid ridge;
border-color プロパティ
border-style: solid;
border-color: #0bd;
border-style: solid;
border-color: tomato;
border-style: solid;
border-color: tan #0bd tomato #000;