.home4 .b-box { width: 100%;}
.pic-list1 { font-size: 0; margin: 0 -.15rem;}
.pic-list1 li { display: inline-block; width: 20%; padding: 0 .15rem;}
.pic-list1 .img-zoom { padding: 72% 0 0;}
@media screen and (max-width: 1024px) { 
.pic-list1 { margin: 0 -.1rem;}
.pic-list1 li { width: 25%; padding: 0 .1rem;}
.pic-list1 li:last-child { display: none;}
}
@media screen and (max-width: 768px) { 
.pic-list1 li { width: 50%;}
}
@media screen and (max-width: 520px) { 
.pic-list1 li { width: 100%;}
}