.ButtonExpand
{
    border-style: none;
    margin: 0px 10px 0px 0px;
    background-image: url('../images/Expand.png');
    background-size: 20px 20px;
    height: 20px;
    width: 20px;
}
  
.ButtonExpand:hover
{
    border-style: none;
    margin: 0px 10px 0px 0px;
    background-image: url('../images/Expand.png');
    background-size: 20px 20px;
    height: 20px;
    width: 20px;
}

.ButtonCollapse
{
    border-style: none;
    margin: 0px 10px 0px 0px;
    background-image: url('../images/Collapse.png');
    background-size: 20px 20px;
    height: 20px;
    width: 20px;
}
  
.ButtonCollapse:hover
{
    border-style: none;
    margin: 0px 10px 0px 0px;
    background-image: url('../images/Collapse.png');
    background-size: 20px 20px;
    height: 20px;
    width: 20px;
}