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*,
*::before,
*::after {
box-sizing: border-box;
background-repeat: no-repeat;
}
::before,
::after {
text-decoration: inherit;
vertical-align: inherit;
}
* {
margin: 0;
}
body {
width: 100%;
margin: 0;
}
main {
display: block;
}
body > header,
body > main,
body > footer {
padding-block: var(--bt-block-spacing-vertical);
}
section {
margin-bottom: var(--bt-block-spacing-vertical);
}
iframe {
width: 100%;
aspect-ratio: 16 / 9;
}