$$ \mathrm {\color{white}\colorbox{#3486e7}{\Large~Polices~}} $$

$\mathtt {Machine~à~écrire}$

$\mathsf {Sans~Serif}$

$\mathbb {PANNEAU~en~majuscules~!}$ $\mathrm {Elégant}$

$\mathcal {A~la~mano}$

\\mathtt {Machine~à~écrire}

\\mathsf {Sans~Serif}
\\mathbb {Panneau}
\\mathrm {Elégant}

\\mathcal {A~la~mano}

$$ \mathrm {\color{white}\colorbox{#3486e7}{\Large~Couleurs~}} $$

$\colorbox{aquamarine}{abc}$

$\color{white}\colorbox{cadetblue}{abc}$

$\color{#f82094}{abc}$

$\color{red}\fbox {abc}$

$\color{#FFFFFF}\colorbox{#f82094}{---(~}\colorbox{#3486e7}{a|b|c}\colorbox{#1c2db9}{~)---}$

\\colorbox{aquamarine}{abc}

\\color{white}\\colorbox{cadetblue}{abc}
\\color{#f82094}{abc}

\\color{red}\\fbox {abc}
\\color{#FFFFFF}\\colorbox{#f82094}{---(~}\\colorbox{#3486e7}{a|b|c}\\colorbox{#1c2db9}{~)---}

$$ \mathrm {\color{white}\colorbox{#f82094}{\Large~Tailles~}} $$

$\tiny {Tiny}$

$\scriptsize Script~Size$

$\footnotesize Footnote$

$\small Small$

$\normalsize Normal$

$\large Large$

$\Large Large$

$\LARGE Large$

$\huge Huge$

$\Huge Huge$

\\tiny {Tiny}
\\scriptsize Script~Size
\\footnotesize Footnote

\\small Small
\\normalsize Normal

\\large large

\\Large Large

\\LARGE Large

\\huge Huge

\\Huge Huge

$$ \mathrm {\color{white}\colorbox{#1c2db9}{\Large~Décorations~}} $$

$\utilde{Vague}$

$\underrightarrow{Flèche~à~droite~~~}$

$\underleftarrow{~~~Flèche~à~gauche}$

$\underline{Souligné}$

$\overline {Surligné}$

$\undergroup{1}~~\undergroup{2}$

$\sout{~barré~}$

$\xcancel{Supprimé}$

$\mathbb{\color{3486e7} {\Huge L}}$ettrine

\\utilde{Vague}

\\underrightarrow{Flèche~à~droite~~~}

\\underleftarrow{~~~Flèche~à~gauche}

\\underline{Souligné}
\\overline {Surligné}

\\undergroup{~~1~~}~~\\undergroup{~~2~~}

\\sout{~barré~}
\\xcancel{Supprimé}

\\mathbb{\\color{3486e7} {\\Huge L}}

$\def\arraystretch{2}\begin{array}{c:c|c||c}{lignes}&{entre}&{les}&{mots}\end{array}$

def\\arraystretch{2}\\begin{array}{c:c|c||c}{lignes}&{entre}&{les}&{mots}\\end{array}

$$ \mathrm {\color{white}\colorbox{#f82094}{\Huge~Un~énorme~texte~complètement~centré~grâce~à~Equation~Bloc~Entier~}} $$

\\mathrm {\\color{white}\\colorbox{#f82094}{\\Huge~~~Un~énorme~texte~complètement~centré~grâce~à~Equation~Bloc~Entier~~~}}

$$ \mathrm {\color{1c2db9} \utilde{~Un~texte~centré~avec~une~jolie~vague~pour~le~soulignement~}} $$

\\mathrm {\\color{1c2db9} \\utilde{~~~Un~texte~centré~avec~une~jolie~vague~pour~le~soulignement~~~}}

$$ \mathrm {\color{3486e7} \fbox{~Un~texte~encadré ~et~centré~grâce~au~bloc~Equation~Bloc~Entier~}} $$

\\mathrm {\\color{3486e7} \\fbox{~~~Un~texte~encadré ~et~centré~grâce~au~bloc~Equation~Bloc~Entier~~~}}

Source originale : https://notionthings.com/2021/01/23/advanced-notion-formatting-using-katex-expressions/