How to download the Homo_sapiens.GRCh38.100.gtf and Homo_sapiens.GRCh38.dna.primary_assembly.fa files for my analysis?

I am trying to perform STAR alignment and I need the reference files for indexing. I would like to know how to download the Homo_sapiens.GRCh38.100.gtf and Homo_sapiens.GRCh38.dna.primary_assembly.fa files so that I can use my following code for indexing :

STAR –runMode genomeGenerate
–genomeDir ${FILE_PATH}/star_gff_genome_index
–genomeFastaFiles ${FILE_PATH}/annotation/Homo_sapiens.GRCh38.dna.primary_assembly.fa
–sjdbGTFfile ${FILE_PATH}/annotation/Homo_sapiens.GRCh38.100.gtf
–sjdbOverhang 100
–runThreadN 21