You can't modify or change the class properties. Instead u can overwrite its property. See below examples..
This is your css class..
.slider-content
{
padding-left: 0px !important;
left: 10%;
right: 10%;
top: 125px;
height: 50px !important;
width:100% !important;
}
JQuery code below..
$(".slider-content").css("padding-left", "10px");
means you are
overwriting only
'padding-left' property of
slider-content class. So only
padding-left property will change, Remaining properties will not change.
To overwrite multiple properties at a time code below..
$('.slider-content').css({'width' : '900px','height' : '50px'});
hope it helps you lot..