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<!-- Full width -->
<div data-view-component="true" class="flash flash-full">
This is a full width flash message!
</div>
<!-- Dismissible -->
<div data-view-component="true" class="flash">
This is a dismissible flash message!
<button id="icon-button-a0446c09-9834-4c76-ba3b-a20a916f5f08" aria-labelledby="tooltip-77ebfcc6-b8ac-4a96-949a-75ecd8b195e2" type="button" data-view-component="true" class="Button Button--iconOnly Button--invisible Button--medium flash-close js-flash-close"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x Button-visual">
<path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
</svg>
</button><tool-tip id="tooltip-77ebfcc6-b8ac-4a96-949a-75ecd8b195e2" for="icon-button-a0446c09-9834-4c76-ba3b-a20a916f5f08" popover="manual" data-direction="s" data-type="label" data-view-component="true" class="sr-only position-absolute">Dismiss alert</tool-tip>
</div>
<!-- With icon -->
<div data-view-component="true" class="flash">
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-info">
<path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path>
</svg>This is a flash message with an icon!
</div>
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# Full width
render(Primer::Beta::Flash.new(full: true)) { "This is a full width flash message!" }
# Dismissible
render(Primer::Beta::Flash.new(dismissible: true)) { "This is a dismissible flash message!" }
# With icon
render(Primer::Beta::Flash.new(icon: :info)) { "This is a flash message with an icon!" }

app/components/primer/beta/flash.css

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/* flash */
/* Default flash */
.flash:not(.Banner) {
position: relative;
padding: var(--base-size-20,1.25rem) var(--control-medium-paddingInline-spacious,1rem);
border-style: solid;
border-width: var(--borderWidth-thin,max(1px, 0.0625rem));
border-radius: var(--borderRadius-medium,0.375rem);
/* Default color */
color: var(--fgColor-default,var(--color-fg-default));
background-image: linear-gradient(var(--bgColor-accent-muted,var(--color-accent-subtle)), var(--bgColor-accent-muted,var(--color-accent-subtle)));
border-color: var(--borderColor-accent-muted,var(--color-accent-muted));
}
.flash:not(.Banner) .octicon {
color: var(--fgColor-accent,var(--color-accent-fg));
margin-right: var(--base-size-12,0.75rem);
}
.flash:not(.Banner) p:last-child {
margin-bottom: 0;
}
/* Contain the flash messages */
.flash-messages {
margin-bottom: var(--stack-gap-spacious,1.5rem);
}
/* Close button */
.flash-close:not(.Banner-close) {
float: right;
margin-top: calc(var(--base-size-4,0.25rem) * -1);
text-align: center;
cursor: pointer;
/* Undo `<button>` styles */
background: none;
border: 0;
-webkit-appearance: none;
appearance: none;
}
.flash-close:not(.Banner-close):hover {
opacity: 0.7;
}
.flash-close:not(.Banner-close):active {
opacity: 0.5;
}
.flash-close:not(.Banner-close) .octicon {
margin-right: 0;
}
/* Action button */
.flash-action:not(.Banner-actions) {
float: right;
margin-top: -3px;
margin-left: var(--stack-gap-spacious,1.5rem);
background-clip: padding-box;
}
.flash-action.btn:not(.Banner-actions) .octicon {
margin-right: var(--control-small-gap,0.25rem);
color: var(--fgColor-muted,var(--color-fg-muted));
}
.flash-action.btn-primary:not(.Banner-actions) {
background-clip: border-box;
}
.flash-action.btn-primary:not(.Banner-actions) .octicon {
color: inherit;
}
/* Color variations */
.flash-warn:not(.Banner) {
color: var(--fgColor-default,var(--color-fg-default));
background-image: linear-gradient(var(--bgColor-attention-muted,var(--color-attention-subtle)), var(--bgColor-attention-muted,var(--color-attention-subtle)));
border-color: var(--borderColor-attention-muted,var(--color-attention-muted));
}
.flash-warn:not(.Banner) .octicon {
color: var(--fgColor-attention,var(--color-attention-fg));
}
.flash-error:not(.Banner) {
color: var(--fgColor-default,var(--color-fg-default));
background-image: linear-gradient(var(--bgColor-danger-muted,var(--color-danger-subtle)), var(--bgColor-danger-muted,var(--color-danger-subtle)));
border-color: var(--borderColor-danger-muted,var(--color-danger-muted));
}
.flash-error:not(.Banner) .octicon {
color: var(--fgColor-danger,var(--color-danger-fg));
}
.flash-success:not(.Banner) {
color: var(--fgColor-default,var(--color-fg-default));
background-image: linear-gradient(var(--bgColor-success-muted,var(--color-success-subtle)), var(--bgColor-success-muted,var(--color-success-subtle)));
border-color: var(--borderColor-success-muted,var(--color-success-muted));
}
.flash-success:not(.Banner) .octicon {
color: var(--fgColor-success,var(--color-success-fg));
}
/* Layout variations */
.flash-full:not(.Banner) {
margin-top: calc(var(--borderWidth-thin,max(1px, 0.0625rem)) * -1);
border-width: var(--borderWidth-thin,max(1px, 0.0625rem)) 0;
border-radius: 0;
}
/* A banner rendered at the top of the page. */
.flash-banner {
position: fixed;
top: 0;
z-index: 90;
width: 100%;
border-top: 0;
border-right: 0;
border-left: 0;
border-radius: 0;
}
/* Makes sure the background is opaque to cover any content underneath */
.flash-full,
.flash-banner {
background-color: var(--bgColor-default,var(--color-canvas-default));
}
/* FIXME deprecate this */
.warning {
padding: 0.5em;
margin-bottom: 0.8em;
font-weight: var(--base-text-weight-semibold,600);
background-color: var(--bgColor-attention-muted,var(--color-attention-subtle));
}