You won’t lose the changes, but heres the CSS from the Marketer site:
.inside-article,
.sidebar .widget,
.comments-area {
border-right: 2px solid rgba(0, 0, 0, 0.07);
border-bottom: 2px solid rgba(0, 0, 0, 0.07);
box-shadow: 0 0 10px rgba(232, 234, 237, 0.5);
}
/* Featured widget */
.sidebar .widget:first-child,
.sidebar .widget:first-child .widget-title{
background-color: #83b0de;
color: #fff;
}
.sidebar .widget:first-child a,
.sidebar .widget:first-child a:hover {
color: #fff;
}
.separate-containers .page-header {
background: transparent;
padding-top: 20px;
padding-bottom: 20px;
}
.page-header h1 {
font-size: 1.5em;
}
.button, .wp-block-button .wp-block-button__link {
padding: 15px 25px;
}
@media (max-width: 768px) {
.post-image img {
max-width: 100%;
}
}