selected row background color not working and also if i do alternative record color not working properly for mouse hover

[Bichitra73]

existing style format below .vcolumn{ display: inline-block; padding: 5px; border-right: 1px solid black;

} I created new style .vcolumnAlt{ display: inline-block; padding: 5px; border-right: 1px solid black; background: gary (added)

}

.data-grid > .container > .vcolumnalter:hover{ background: -webkit-linear-gradient(black,gray);; }

in HTML I use

{{row[key.name]}}

issue# 1: mouse hover not working for dynamically added for vcolumnAlt. 2nd how to make record selected with different color if i click the record untill i click other row