How Can I Create Diagonal Lines in a DIV Background Using CSS?

Creating Diagonal Lines in a DIV Background Using CSS

Problem Statement

Consider the following HTML and CSS code:

<div class="preview-content">
  PREVIEW
</div>

.preview-content {
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAAGklEQVQIW2NkYGD4D8SMQAwGcAY2AbBKDBUAVuYCBQPd34sAAAAASUVORK5CYII=) repeat;
  width: 100%;
  min-height: 300px;
  max-height: 300px;
  line-height: 300px;
  text-align: center;
  vertical-align: middle;
  font-size: 2em;
}

The objective is to add diagonal lines to the background of the preview-content div, as seen in the following image:

[Image of a DIV with diagonal lines]

Solution

A scalable solution that dynamically adjusts to the element's dimensions can be achieved using CSS3 linear-gradients and the calc() function.

.crossed {
  background: 
    linear-gradient(to top left,
        rgba(0,0,0,0) 0%,
        rgba(0,0,0,0) calc(50% - 0.8px),
        rgba(0,0,0,1) 50%,
        rgba(0,0,0,0) calc(50% + 0.8px),
        rgba(0,0,0,0) 100%),
    linear-gradient(to top right,
        rgba(0,0,0,0) 0%,
        rgba(0,0,0,0) calc(50% - 0.8px),
        rgba(0,0,0,1) 50%,
        rgba(0,0,0,0) calc(50% + 0.8px),
        rgba(0,0,0,0) 100%);
}

<textarea class="crossed"></textarea>

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