Add these codes to the Custom CSS box and click Save

Desktop Only

/* Desktop Only */
@media screen and (min-width:768px) {
  footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}}

Mobile Only

/* Mobile Only */
@media screen and (max-width:767px) {
 footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Blog Page (list)

/* Blog Page (list) */
[class*="type-blog"].view-list {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Blog Post

/* Blog Post */
[class*="type-blog"].view-item {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Event List

/* Event List */
[class*="type-event"].view-list {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Event Detail

/* Event Detail */
[class*="type-events"].view-item {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Shop/Category

/* Shop/Category */
[class*="type-products"].view-list {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Individual Product

/* Individual Product */
[class*="type-products"].view-item {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Cart Page

/* Cart Page */
body#cart {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Homepage Only

/* Homepage Only */
body.homepage {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

Other pages (exclude homepage)

/* Other pages - exclude homepage */
body:not(.homepage) {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

On Scroll Only

/* On Scroll Only */
header#header.shrink ~ footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}

When the burger menu is open

/* When burger menu is open */
body.header--menu-open {
   footer.sections {
      &{
  background-color: #f1f;
}
.section-background, .section-border {
  background-color: transparent !important;
}}
}

One Page

Add this code to Page Header Code Injection and click Save

If you use a Personal Plan (doesn’t support Code Injection), you can add code to Code Block.

<!-- Footer background color - One Page -->
<style>
footer.sections {
  background-color: #f1f;
}
footer.sections .section-background, footer.sections .section-border {
  background-color: transparent !important;
}
</style>