Branding Master Page SharePoint 2010 - center fix contents

Remove scroll="no" from body tag

body
{
overflow:auto !important;
}
/* start : make ribbon fix and keep in center*/
#s4-ribbonrow
{
width:1003px !important;
margin:auto !important;
float:none;
height:100% !important;
}
#s4-ribboncont
{
background-color:rgb(33, 55, 76) !important;
z-index:1000;
width:1003px;
}
/* end : make ribbon fix and keep in center*/
#s4-bodyContainer, #s4-statusbarcontainer, #s4-mainarea
{
width:1003px;
margin:auto;
float:none !important;
}
.s4-ca {
margin-left:0px !important;
}
body #s4-workspace {
left:0;
overflow:visible;
position:relative;
}

html.ms-dialog body #s4-workspace {
overflow-x:auto;
overflow-y:scroll;
}