qwc2/plugins/style/Authentication.css

QGIS Web Client

div.login-user {
    position: absolute;
    right: 0.25em;
    top: 0.25em;
    z-index: 1;
    color: var(--panel-text-color);
    background-color: var(--panel-bg-color);
    box-shadow: 0 0 4px rgba(136, 136, 136, 0.5);
    padding: 0.25em 0em 0.125em 0em;
    display: flex;
}

div.login-user > span {
    flex: 0 0 auto;
    padding: 0 0.25em;
}