stylesheet.css

.paper-mm-selected-window {
    border: 10px cyan; /* if we need to operate in pre-scaled dimension */
    border-radius: 5px;
}


.workspace-icon-button {
    -st-icon-style: symbolic;
    border: none;
    border-radius: 8px;
    padding: 8px;
}

.workspace-icon-button StIcon {
    icon-size: 16px;
}

.paperwm-selection {
    border-radius: 8px;
}