試試這個:
background-image: -webkit-repeating-linear-gradient(-45deg, rgba(29,178,216,0.3), rgba(29,178,216,0.3) 25%, transparent 25%, transparent 50%, rgba(29,178,216,0.3) 50%);
background-image: -moz-repeating-linear-gradient(-45deg, rgba(29,178,216,0.3), rgba(29,178,216,0.3) 25%, transparent 25%, transparent 50%, rgba(29,178,216,0.3) 50%);
background-image: -ms-repeating-linear-gradient(-45deg, rgba(29,178,216,0.3), rgba(29,178,216,0.3) 25%, transparent 25%, transparent 50%, rgba(29,178,216,0.3) 50%);
background-image: -o-repeating-linear-gradient(-45deg, rgba(29,178,216,0.3), rgba(29,178,216,0.3) 25%, transparent 25%, transparent 50%, rgba(29,178,216,0.3) 50%);
background-image: repeating-linear-gradient(-45deg, rgba(29,178,216,0.3), rgba(29,178,216,0.3) 25%, transparent 25%, transparent 50%, rgba(29,178,216,0.3) 50%);
-webkit-background-size: 4px 4px;
-moz-background-size: 4px 4px;
-o-background-size: 4px 4px;
background-size: 4px 4px;
/* Background size must be an even number! */
請看看這有助於[鏈接](https://developer.mozilla.org/en-US/docs/Web/CSS/repeating-linear-gradient) –