div.wp-block.image-grid {
margin-top: 70px;
}
div.wp-block.image-grid .grid-item {
margin-bottom: 20px;
position: relative;
}
div.wp-block.image-grid .grid-item-caption {
background: #2D3F40;
color: #fff;
position: absolute;
bottom: 0px;
left: 0px;
font-weight: 800;
font-size: 16px;
line-height: 20px;
width: 100%;
padding: 15px 20px;
} 
div.wp-block.image-grid.is-admin:before {
display: block;
content: "";
top:0;
left: 0;
right: 0;
bottom: 0;
position: absolute;
z-index: 1;
}
div.wp-block.image-grid .row {
margin-bottom: 60px;
margin-top: 20px;
}
@media (max-width: 768px) { 
div.wp-block.image-grid{
margin-top: 40px;
}
div.wp-block.image-grid .row{
margin-bottom: 30px;
}
div.wp-block.image-grid .row img {
margin-bottom: 30px;
}
}