<linearGradient id="grad" x1="0" x2="0" y1="0" y2="1">
y2
заменить значение с 1
на 100%
:<linearGradient id="grad" x1="0" x2="0" y1="0" y2="100%">
gradientUnits
со значением userSpaceOnUse
:<linearGradient id="grad" x1="0" x2="0" y1="0" y2="100%" gradientUnits="userSpaceOnUse">
gradientUnits
.background-color: #000000;
background-image: url(http://30r.biz/images/st/gol/jk/25%D1%8525/JapKros-Lico-25x25.png);
background-repeat: no-repeat;
background-position: center;