we use the napili theme which has a width of 1140px. For a specific page i created a new community layout with the following code:
<aura:attribute name="column1" type="Aura.Component[]" required="false"/>
<div class="container">
<div class="contentPanel">
{!v.column1}
</div>
</div>
and the following css
.THIS .contentPanel:before,
.THIS .contentPanel:after {
content: "";
display: table;
}
.THIS .contentPanel {
width: 100%;
}
But through this layout will be inserted into
<div class="cCenterPanel" tabindex="-1" data-aura-rendered-by="247:0">
which has max-width:1140px it is not possible to get this page full width over the whole desktop.
Does anyone have an idea, how to override this max-width for that special page?