.box-l      { float: left;  padding: 0px 0.5em; background-color: #e0e0e0; width:25%; margin-right: 4px; }
.box-r      { float: right; padding: 0px 0.5em; background-color: #e0e0e0; width:25%; margin-left:  4px; }

.fl-l       { float: left;  padding: 0px 0.5em;                                       margin-right: 4px; }
.fl-r       { float: right; padding: 0px 0.5em;                                       margin-left:  4px; }

.sidebar {
    margin-left: 4px;
    width: 25%;
    float: right;
    border: 4px solid #fff;
}