Answer by wenyi for Change sort icon in Bootstrap Table

You can try to custom your css style, for example like this:

.fixed-table-container thead th .both {    background-image: none;}.fixed-table-container thead th .asc {    background-image: url(asc.png);}.fixed-table-container thead th .desc {    background-image: url(desc.png);}

jsFiddle link: http://jsfiddle.net/e3nk137y/3258/