documentclass[12pt,a4paper,oneside]{report}
usepackage[top=2.5cm, bottom=2.5cm, left=2.5cm, right=2.5cm]{geometry}
usepackage{graphicx}
usepackage{setspace}
usepackage[utf8]{inputenc}
usepackage{floatrow}
usepackage{multirow,bigdelim}
usepackage{booktabs}
usepackage{textgreek}
usepackage{gensymb}
usepackage[label font=bf,labelformat=simple]{subfig}%using for my other figures
usepackage[font=footnotesize,labelfont=bf]{caption}%also using for my other figures
    floatsetup[table]{capposition=top,captionskip=0pt}
usepackage[table]{xcolor}
    definecolor{GrayTable}{gray}{0.90}
    definecolor{GrayText}{gray}{0.55}
    definecolor{BlueTable}{rgb}{0.0,0.6,0.9}

begin{document}

begin{table}[!htb]
    caption{Mix PCR pour vérifier la présence des LCT}
    rowcolors{2}{GrayTable}{white}
    resizebox{textwidth}{!}{% Using this command because the table is large
    begin{tabular}{ccccc}
    toprule
    rowcolor{BlueTable} LCT & Séquence SU & Taille de l'amplicon (pb) & Température d'hybridation (degree C) & Concentration en MgCl$_{2}$ \
    midrule
LCT_0071   &   AAAAGAGCGTGTTATTTTAGGCA &   200 &   60  &   2   \
LCT_0078   &   TGGCCACCTTCTCTTTCCAT    &   143 &   60  &   2   \
LCT_0090   &   ACGGCTTTGCTTTCAGTTGT    &   160 &   60  &   2   \
    bottomrule
    end{tabular}}
end{table}

begin{table}[!htb]
    singlespacing
    caption{Mix PCR pour vérifier la présence des LCT}
    begin{tabular}{ccccc}
    toprule
    rowcolor{BlueTable} Réactifs & Concentration initiale & Concentration finale & Volume pour 1 tube (textmu L)  \
    midrule
    Buffer & 5X & 1X & 5\
    bottomrule
    end{tabular}
end{table}