.sheet-grade5-ela{background-image:url('images/grade5-ela.webp')}
.sheet-grade5-math{background-image:url('images/grade5-math.webp')}
.sheet-grade5-science{background-image:url('images/grade5-science.webp')}
.sheet-grade5-social{background-image:url('images/grade5-social.webp')}
.sheet-grade1-ela{background-image:url('images/grade1-ela-visuals.webp')}
.sheet-grade2-ela{background-image:url('images/grade2-ela-visuals.webp')}
.sheet-grade3-ela{background-image:url('images/grade3-ela-visuals.webp')}
.sheet-grade3-science{background-image:url('images/grade3-science.webp')}
@media(min-width:900px){.grades{grid-template-columns:repeat(3,1fr)}}