blinkingtext is on all screens because of /deep/ - CSS

Question

I implemented a blinkingtext animation on my system to keep blinking red, but I want it only on the screen that I am putting the code and not at all. Follow the code below.

/deep/ nb-layout-header nav { 
    animation:blinkingText 1s infinite; 
}
@keyframes blinkingText {
    0% { 
        background-color: #374355; 
    } 
    100%{ 
        background-color: #D42333; 
    } 
}