7.1 background cover issue

Site URL: https://circle-perch-tjz7.squarespace.com/

I set up custom background CSS in 7.1 to better control background image display. On all my devices, the background covers the entire available window on desktop as it is supposed to. However, the client sees a gray bar (perhaps the footer?) at the bottom of many pages (see screenshot). I cannot replicate the issue to know how to fix it.

Website: https://circle-perch-tjz7.squarespace.com/

Password: sylvie

Here is an excerpt of my CSS to show how I'm handling backgrounds. What am I missing?

html {
   margin: 0px;
   height: 100%;
   width: 100%;
}

body {
   margin: 0px;
   min-height: 100%;
   width: 100%;
}

//Home page background image
  [data-section-id="5f1626aa2c989e153c61709b"]{
  .section-background{
    &::after {
    //creating the element      
      content: "";
      min-height: 100%;
      min-width: 100%;
      position: absolute;
	  overflow:hidden;
      
      //adding the image
      background:linear-gradient(0deg, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0)), url(https://images.squarespace-cdn.com/content/v1/5f162629116ffb55fd39047b/1597376721865-I6N76XU9FTUT2G1AUA1B/ke17ZwdGBToddI8pDm48kNkDGXY7AXqwLIWET4ImKlUUqsxRUqqbr1mOJYKfIPR7LoDQ9mXPOjoJoqy81S2I8N_N4V1vUb5AoIIIbLZhVYxCRW4BPu10St3TBAUQYVKcF09kKCraTKS-JXnG8fhU-45lhBCEWgFGgVsOAz0fbLadd2IWWcjtxmbrxzKBL8hL/sylviebg-Home.jpg) no-repeat;
      
      //positioning the image
      background-position:center center;
       background-attachment: fixed !important; 
-webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;

      //Home page mobile background 
      @media(max-width:787px){
        background:linear-gradient(0deg, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0)), url(https://images.squarespace-cdn.com/content/v1/5f162629116ffb55fd39047b/1597727139192-IGUVEZU8U3DIMSYPBVJV/ke17ZwdGBToddI8pDm48kPoswlzjSVMM-SxOp7CV59BZw-zPPgdn4jUwVcJE1ZvWQUxwkmyExglNqGp0IvTJZamWLI2zvYWH8K3-s_4yszcp2ryTI0HqTOaaUohrI8PI7Hk5b7wKtplcrxPf3ag-g6VC0ObVEO8cEICumLtlwuA/sylviebg-Home-mobile.png) no-repeat; 
        background-size: 100% !important;
        background-position:top center;
        background-attachment: scroll !important;
      }
    } 
  }
}


footer {display:none;}

#footer-sections {
  display: none;
}

footer.sections {
  	display: none;
  }

html {
   margin: 0px;
   height: 100%;
   width: 100%;
}

body {
   margin: 0px;
   min-height: 100%;
   width: 100%;
}

//Home page background image
section[data-section-id="5f1626aa2c989e153c61709b"] {
	min-height: 100vh !important;
}

  [data-section-id="5f1626aa2c989e153c61709b"]{
  .section-background{
    &::after {
    //creating the element      
      content: "";
      min-height: 100%;
      min-width: 100%;
      position: absolute;
	  overflow:hidden;
      
      //adding the image
      background:linear-gradient(0deg, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0)), url(https://images.squarespace-cdn.com/content/v1/5f162629116ffb55fd39047b/1597376721865-I6N76XU9FTUT2G1AUA1B/ke17ZwdGBToddI8pDm48kNkDGXY7AXqwLIWET4ImKlUUqsxRUqqbr1mOJYKfIPR7LoDQ9mXPOjoJoqy81S2I8N_N4V1vUb5AoIIIbLZhVYxCRW4BPu10St3TBAUQYVKcF09kKCraTKS-JXnG8fhU-45lhBCEWgFGgVsOAz0fbLadd2IWWcjtxmbrxzKBL8hL/sylviebg-Home.jpg) no-repeat;
      
      //positioning the image
      background-position:center center;
       background-attachment: fixed !important; 
-webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;

      //Home page mobile background 
      @media(max-width:787px){
        background:linear-gradient(0deg, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0)), url(https://images.squarespace-cdn.com/content/v1/5f162629116ffb55fd39047b/1597727139192-IGUVEZU8U3DIMSYPBVJV/ke17ZwdGBToddI8pDm48kPoswlzjSVMM-SxOp7CV59BZw-zPPgdn4jUwVcJE1ZvWQUxwkmyExglNqGp0IvTJZamWLI2zvYWH8K3-s_4yszcp2ryTI0HqTOaaUohrI8PI7Hk5b7wKtplcrxPf3ag-g6VC0ObVEO8cEICumLtlwuA/sylviebg-Home-mobile.png) no-repeat; 
        background-size: auto 100%;
        background-position:right center;
        background-attachment: scroll !important;
      }
    } 
  }
}


footer {display:none;}

#footer-sections {
  display: none;
}

footer.sections {
  	display: none;
  }

I think she mentioned about this issue when screen is resize, I updated the code above