You probably just need to add h4 and p before the color property when hovering.
Try this:
/* apply the hover effect to all the blocks */
#block-4d9159bed5c68c86d676:hover,
#block-5fe23bf021cbdac4b243:hover,
#block-58052db15bcb402167b3:hover,
#block-362f90c2afaf8844ec0c:hover,
#block-75ac13840ab92eacc286:hover,
#block-569f7648aaa626926741:hover {
background: rgba(248, 240, 226, 0.5); /* change background color to transparent beige on hover */
h4, p {
color: #444441 !important; /* change text color to #444441 on hover */
}
}