blue gradient color code example
Example 1: uigradients
background: #0f2027; /* fallback for old browsers */
background: -webkit-linear-gradient(to right, #0f2027, #203a43, #2c5364); /* Chrome 10-25, Safari 5.1-6 */
background: linear-gradient(to right, #0f2027, #203a43, #2c5364); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
Example 2: gradient
Here a codePen with cool gradient animations:
https://codepen.io/DevLorenzo/pen/ExgpvJM