sandpaper: unknown div text-center

[albhasan]

The command sandpaper::validate_lesson() is throwing a validation error and I don't know how to handle it:

episodes/02-project-intro.Rmd:31 [unknown div] text-center

It seems like sandpaper can't handle a text-center div used to quote a tweet by Vince Buffalo.

My session info is:

R version 4.0.4 (2021-02-15)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Debian GNU/Linux 11 (bullseye)

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.9.0
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.9.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] sandpaper_0.12.3

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.10       whisker_0.4.1     tinkr_0.2.0       xml2_1.3.4       
 [5] magrittr_2.0.3    tidyselect_1.2.0  xslt_1.4.4        gert_1.9.2       
 [9] R6_2.5.1          rlang_1.1.1       fansi_1.0.4       dplyr_1.1.2      
[13] tools_4.0.4       sys_3.4.2         utf8_1.2.3        cli_3.6.1        
[17] commonmark_1.9.0  askpass_1.1       rprojroot_2.0.3   openssl_2.0.6    
[21] yaml_2.3.7        assertthat_0.2.1  tibble_3.2.1      lifecycle_1.0.3  
[25] processx_3.8.1    purrr_1.0.1       callr_3.7.3       vctrs_0.6.2      
[29] fs_1.6.2          credentials_1.3.2 ps_1.7.5          glue_1.6.2       
[33] compiler_4.0.4    pillar_1.9.0      generics_0.1.3    pegboard_0.5.2   
[37] pkgconfig_2.0.3