Hello,

1) Please try adding the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.

.title-size-small {
    padding: 35px 0 35px;
}

2) Please try adding the following Custom CSS in the Custom CSS for Desktop area under Theme Settings >> Custom CSS.

.category-grid-item .category-image-wrapp {
    height: 200px;
}

3) Please try adding the following Custom CSS in the Custom CSS for Mobile area under Theme Settings >> Custom CSS.

.wd-search-full-screen .searchform input[type="text"]::placeholder {
    font-size: 16px;
}

4) Please try adding the following Custom CSS in the Custom CSS for Mobile area under Theme Settings >> Custom CSS.

.wd-nav-mob-tab {
    background-color: red;
}

Best Regards