PuppyClient/Assets/UI Toolkit/rootUIStyle.uss

.rootUIBase {
    flex-grow: 1;
    margin-top: 25px;
    margin-bottom: 20px;
    margin-left: 10px;
    margin-right: 10px;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
}