Use this CSS code to Style > Custom CSS. Adjust 1.5 to value what you want.
.eapp-logo-showcase-logo-inner:hover {
transform: scale(1.5);
transition: transform 0.3s;
}
.eapp-logo-showcase-logo-inner {
transition: transform 0.3s;
}
div.eapp-logo-showcase-logo-showcase-content {
overflow: visible;
}