No changing background contrast with this options

[Gallusik]

{
background: #5A7796;
background: -webkit-linear-gradient(top, #A3B4C8 0, #607E9F 459px, #2C3A49 1050px) no-repeat;
background: -moz-linear-gradient(top, #A3B4C8 0, #607E9F 459px, #2C3A49 1050px) no-repeat;
background: -o-linear-gradient(top, #A3B4C8 0, #607E9F 459px, #2C3A49 1050px) no-repeat;
background: -ms-linear-gradient(top, #A3B4C8 0, #607E9F 459px, #2C3A49 1050px) no-repeat;
background: linear-gradient(to bottom, #A3B4C8 0, #607E9F 459px, #2C3A49 1050px) no-repeat;
-svg-background: linear-gradient(top, #A3B4C8 0, #607E9F 459px, #2C3A49 1050px) no-repeat;
background-attachment: fixed !important;
margin: 0 auto;
font-size: 13px;
font-family: Arial, 'Arial Unicode MS', Helvetica, Sans-Serif;
font-weight: normal;
font-style: normal;
position: relative;
width: 100%;
min-height: 100%;
left: 0;
top: 0;
cursor: default;
overflow: hidden;
}