Borders

Border refers to the boundary line of an element.

Using CSS border properties, you can draw a line around the boundary of an element and specify the style, width, and color of this line.

border style

You can set the border to be solid, dotted, double, etc.

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.box {
  border-style: solid; /* solid line */
}

Other styles include dotted (dotted line), dashed (dashed line), double (double line), etc.

border width

border-width allows you to adjust the thickness of the border.

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.box {
  border-width: 5px; /* 5 pixels thick */
}

border color

You can specify the border color using border-color with text like "red" or RGB and hex codes.

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.red-box {
  border-color: red; /* red border */
}

.green-box {
  border-color: #00ff00; /* green border */
}

.blue-box {
  border-color: rgb(0, 0, 255); /* blue border */
}

Setting different borders for each side

Just like you can stick different kinds of tapes on each side of a box, you can set different borders for each side in CSS.

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.box {
  border-top: 3px solid blue; /* 3 pixels thick, solid blue line at the top */
  border-right: 5px dashed green; /* 5 pixels thick, dashed green line on the right */
  border-bottom: 2px dotted red; /* 2 pixels thick, dotted red line at the bottom */
  border-left: 4px double purple; /* 4 pixels thick, double purple line on the left */
}

Follow along with the highlighted parts of the code to input your own.