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Border not displaying in my Visual studio

After my t-border is not responding I add just in each class border-top. But still not showing.

.primary-content{ border-top: 2px solid red; text-align: center; }

.secondary-content { text-align: center; border-top: 2px solid red; }

main-footer {

padding-top: 60px; padding-bottom: 60px; border-bottom: solid 10px orange; background: grey; border-top: 1px solid blue; border-radius: 10px; }