background: rgb(13,20,54);
background: linear-gradient(180deg, rgba(13,20,54,1) 0%, rgba(40,57,119,1) 30%, rgba(63,69,125,1) 50%, rgba(40,57,119,1) 70%, rgba(20,36,93,1) 100%);
<!-- @Zenonymous -->
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+ */
background: #000428; /* fallback for old browsers */
background: -webkit-linear-gradient(to bottom, #000428, #004e92); /* Chrome 10-25, Safari 5.1-6 */
background: linear-gradient(to bottom, #000428, #004e92); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
background: #1a2980; /* fallback for old browsers */
background: -webkit-linear-gradient(to right, #1a2980, #26d0ce); /* Chrome 10-25, Safari 5.1-6 */
background: linear-gradient(to right, #1a2980, #26d0ce); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */