Report Button CSS

1. class="t-Button t-Button--hot"

2. class="add t-Button t-Button--warning t-Button--simple t-Button--stretch"

3. class="t-Button--small t-Button--simple t-Button--hot t-Button--stretch"

class="t-Button t-Button--hot"

Apex Report Header Image Size (CSS)

Catch Apex Report by Header

Here imgid is static id of apex header.

td[headers="imgid"] img{
    width: 50px;
    height: 50px;
}