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 效果如图

.three-net-item {position: relative;
}.three-net-item:first-of-type::before {content: "";position: absolute;top: 0;left: 0;width: 100%;height: 1px;background: linear-gradient(to right, transparent, #1c65c6, transparent);}.three-net-item:first-of-type::after {content: "";position: absolute;bottom: 0;left: 0;width: 100%;height: 1px;background: linear-gradient(to right, transparent, #1c65c6, transparent);}.three-net-item:last-of-type::after {content: "";position: absolute;bottom: 0;left: 0;width: 100%;height: 1px;background: linear-gradient(to right, transparent, #1c65c6, transparent);}