Check out example codes for "css not first child". It will help you in understanding the concepts better.

Code Example 1

.block:not(:first-child) {
    background-color: #990000;
}

//if you need to support legacy browsers then follow the below solution

.block {
    background-color: #990000;  /* applies to every ul */
}

.block:first-child {
    background-color: transparent; /* limits the scope of the previous rule */
}

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