@openui5/sap.ui.core/src/sap/ui/thirdparty/qunit-composite.css

OpenUI5 Core Library sap.ui.core

.qunit-composite-suite {
    position: fixed;
    bottom: 0;
    left: 0;

    margin: 0;
    padding: 0;
    border-width: 1px 0 0;
    height: 45%;
    width: 100%;

    background: #fff;
}