ok I see, you can find this under css/ppom-styles.css near line 318:
#ppom_tooltip{
font-family: Ubuntu, sans-serif;
font-size: 0.875em;
text-align: center;
text-shadow: 0 1px rgba( 0, 0, 0, .5 );
line-height: 1.5;
color: #fff;
background: -webkit-linear-gradient( top, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.88) );
background: -moz-linear-gradient( top, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.88) );
background: -ms-radial-gradient( top, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.88) );
background: -o-linear-gradient( top, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.88) );
background: linear-gradient( top, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.88) );
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
border-top: 1px solid #fff;
-webkit-box-shadow: 0 3px 5px rgba( 0, 0, 0, .3 );
-moz-box-shadow: 0 3px 5px rgba( 0, 0, 0, .3 );
box-shadow: 0 3px 5px rgba( 0, 0, 0, .3 );
position: absolute;
z-index: 10024;
padding: 15px;
overflow: visible;
}
#ppom_tooltip:after{
width: 0;
height: 0;
border-left: 10px solid transparent;
border-right: 10px solid transparent;
border-top: 10px solid #333;
border-top-color: rgba( 0, 0, 0, .7 );
content: '';
position: absolute;
left: 50%;
bottom: -10px;
margin-left: -10px;
}
#ppom_tooltip.top:after{
border-top-color: transparent;
border-bottom: 10px solid #333;
border-bottom-color: rgba( 0, 0, 0, .6 );
top: -20px;
bottom: auto;
}
#ppom_tooltip.left:after{
left: 10px;
margin: 0;
}
#ppom_tooltip.right:after{
right: 10px;
left: auto;
margin: 0;
}