Create a seamless connection between two border lines

Whenever I try to create an angle between two borders, I end up with a jagged (pixeled) line.

Take a look at the code snippet below:

  <div id="example"></div>

   #example:before{
    content: "";
    position: relative;
    width: 0;
    height: 0;
    left: 0;
    bottom: -40px;
    border-top: 20px solid black;
    border-left: 470px solid red;
}

Check out this fiddle for demonstration: http://jsfiddle.net/pan1cmode/bQYU7/2/

Does anyone have suggestions on how to make the angle smooth?

Answer №1

Indeed, the effect you are seeking is referred to as anti-aliasing, as mentioned by Layne.

One method to achieve this is by utilizing gradients.

See a demonstration here

#Ex2 {
    position: absolute;
    height: 40px;
    width: 470px;
    top: 80px;
    background: linear-gradient(3deg, red 39px, black 42px);
}

The level of smoothness can be adjusted by altering the difference between the red and black stop points. (in this instance, between 39 and 42 px)

Answer №2

The stretching issue is caused by the high value of border-left. To solve this problem, use equal values for the border.

Check out this example on jsfiddle: http://jsfiddle.net/bQYU7/3/

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