spreed/css/At.scss

// Copied from vue-at (https://github.com/fritx/vue-at/blob/d16d5eefdae8987c0bffe2d9c3867b7da12c808f/src/At.scss)
// and wrapped to affect only the panel for candidate mentions.

.talk.candidate-mentions {

	// atwho.css https://github.com/ichord/At.js
	.atwho-view {
		// position:absolute;
		// top: 0;
		// left: 0;
		// display: none;
		// margin-top: 18px;
		// background: white;
		color: black;
		// border: 1px solid #DDD;
		border-radius: 3px;
		box-shadow: 0 0 5px rgba(0,0,0,0.1);
		min-width: 120px;
		z-index: 11110 !important;
	}
	.atwho-ul {
		/* width: 100px; */
		list-style:none;
		// padding:0;
		// margin:auto;
		// max-height: 200px;
		// overflow-y: auto;
	}
	.atwho-li {
		display: block;
		// padding: 5px 10px;
		// border-bottom: 1px solid #DDD;
		// cursor: pointer;
		/* border-top: 1px solid #C8C8C8; */
	}

	////// added 1
	.atwho-view {
		// font-size: 14px;
		// min-width: 140px;
		// max-width: 180px;
		border-radius: 6px;
		// overflow: hidden;
		box-shadow: 0 0 10px 0 rgba(101, 111, 122, .5);
	}
	.atwho-ul {
		max-height: 135px;
		padding: 0;
		margin: 0;
	}
	.atwho-li {
		box-sizing: border-box;
		height: 27px;
		padding: 0 12px;
		white-space: nowrap;
		display: flex;
		align-items: center;
		span {
			overflow: hidden;
			text-overflow: ellipsis;
		}
	}
	.atwho-cur {
		// background: #44a8f2;
		background: #5BB8FF;
		color: white;
	}

	////// added 2
	.atwho-wrap {
		position: relative;
	}
	&.atwho-panel {
		position: absolute;
	}
	.atwho-inner {
		position: relative;
	}
	.atwho-view {
		position: absolute;
		bottom: 0;
		left: -0.8em; // 抵消左边距
		cursor: default;
		background-color: rgba(255,255,255,.94);
		min-width: 140px;
		max-width: 180px;
		max-height: 200px;
		overflow-y: auto;
		&::-webkit-scrollbar {
			width: 11px;
			height: 11px;
		}
		&::-webkit-scrollbar-track {
			// background-color: rgba(127, 127, 127, .1);
			background-color: #F5F5F5;
		}
		&::-webkit-scrollbar-thumb {
			min-height: 36px;
			border: 2px solid transparent;
			border-top: 3px solid transparent;
			border-bottom: 3px solid transparent;
			background-clip: padding-box;
			border-radius: 7px;
			// background-color: rgba(0, 0, 0, 0.2);
			background-color: #C4C4C4;
		}
	}
}

.talk.candidate-mentions {
	// Override "max-width: 180px", as that makes the autocompletion panel too
	// narrow.
	.atwho-view {
		max-width: 300px;
		min-width: 250px;
		// mention height: 48 * visible mentions: 4.5
		max-height: 216px;
	}
	// Override max height to show 4.5 mentions to make clear you can scroll for more options
	.atwho-ul {
		// (padding top: 4 + avatar height: 48 + padding bottom: 4) * visible mentions: 4.5
		max-height: unset;
	}

	// Override autocompletion panel items height, as they are too short
	// for the avatars and also need some padding.
	.atwho-li {
		height: 64px;
		padding-top: 4px;
		padding-bottom: 4px;
	}

	// Although the height of its wrapper is 32px the height of the icon
	// is the default 16px. This is a temporary fix until it is fixed
	// in the avatar component.
	.atwho-li .icon-group-forced-white {
		width: 44px;
		height: 44px;
	}

	// Override all colors with our theming and dark mode
	.atwho-view {
		background: var(--color-main-background);
		color: var(--color-main-text);
		box-shadow: 0 0 5px var(--color-box-shadow);

		&::-webkit-scrollbar-track {
			background-color: var(--color-background-dark);
		}
		&::-webkit-scrollbar-thumb {
			background-color: var(--color-background-darker);
		}

		.atwho-cur {
			background: var(--color-primary-light);
			color: var(--color-main-text);
		}
	}
}

// Override conflicting rules from the comments tab.
.talk.candidate-mentions {
	.atwho-view {
		top: unset;
		display: unset;
	}
}