$\color{#466cca}\rule{600px}{5px}$
To change this line: \color{#466cca}\rule{600px}{5px}
{#466cca} is Hex code
{600px} is how long the line is
{5px} is thickness
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For a note section inside a box, like you see in home page:
/callout
/button
Create New Action
\color{94bd64}{𖧧}
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\cal {text} --- calligraphy \frak {Text} -- Gothic \sf {text} --- serf font \rm {text} --- roman \Bbb {Text} --- Blackboard \tt {text} --- Typewriter
Code: \color{#466cca}\Bbb{Text~Example}

$\color{#466cca}\Bbb{Text~Example}$ — BlackBoard
$\color{#466cca}\tt{Text~Example}$ — Typewriter
$\color{#466cca}\rm{Text~ Example}$ — Roman
$\color{#466cca}\sf{Text~Example}$ — Serf Font
$\color{#466cca}\frak{Text~Example}$ — Gothic
$\color{#466cca}\cal{Text~Example}$ — Calligraphy