Ahoy,
First, be sure to be kind to folks here by asking your questions as a reproducible example (looks like you had a newline+backticks issue).
I personally like to use kableExtra for simple table styling. So your line with the table will be:
```{r}
library(kableExtra)
library(dplyr)
tab1<-c(seq(1,10,1))
table(tab1) %>%
kable('html') %>%
kable_styling(bootstrap_options = "striped", full_width = F)
```
Check out more options here: Create Awesome HTML Table with knitr::kable and kableExtra Hao Zhu 2018-01-15
If you want super granular control over options, check out the custom css options you have with rmarkdown and slidy.