/* apply this code in page CSS -> Inline */
.first-group{
    border: 10px solid #C6DAB5;
    border-bottom: none;
    border-radius: 0;
    padding: 5px!important;
}

.middle-group{
    border: 10px solid #C6DAB5;
    border-bottom: none;
    border-top: none;
    border-radius: 0;
    padding: 5px!important;
}
    
.last-group{
    border: 10px solid #C6DAB5;
    border-top: none;
    border-radius: 0;
    padding: 5px!important;
}

/* Select Regioin then Layout->Column CSS Classes-> 'here apply class name'*/
First region = first-group
Middle all region = middle-group
Last region = last-group