选择元素中的白色框使用Chrome

Question

我在CSS中设置的选择框有问题。将鼠标悬停在Chrome中时会出现白框。在Safari中一切都很好。有线索吗？ 我添加了我的CSS和HTML，以及问题的图片。第一个是Safari，第二个是Chrome

.dropdown {
	position: relative;
	margin: 0 auto;
	top: 10;
	left 50%;
	width: 190px;
	height: 2em;
	line-height: 2;
	background: #E9B6B0;
	overflow:scroll	;
	border-radius: .35em;
	margin-bottom: 5px;

}
.dropdown select {
	-webkit-appearance: none;
	-moz-appearance: none;
	-ms-appearance: none;
	appearance: none;
	background-image: none; /* remove the value that chrome dose not use */
    background-color: #E9B6B0; /* set the value it does */
    border-radius: 4px;     /* make it look kinda like the background image */
    border: 1px solid #888;
	outline: 0;
	box-shadow: none;
	border: 0 !important;
	background: #E9B6B0;
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0 0 0 .5em;
	color: black;
	cursor: pointer;
	font-size: 15px;

}

.dropdown::after {
	content: '\25BE';
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	padding: 0 1em;
	background: #E9B6B0;
	pointer-events: none;
}

.dropdown:hover::after {
	color: white;
}
.dropdown::after {
	-webkit-transition: .25s all ease;
	-o-transition: .25s all ease;
	transition: .25s all ease;
}

<div class="dropdown">
	<select id="genre" onchange="filterConcerts()" value="default">
		<option value="default">Sjanger</option>
</div>

Answer 1

更改溢出：滚动;溢出：auto;在.dropdown类中

.dropdown {
	position: relative;
	margin: 0 auto;
	top: 10;
	left 50%;
	width: 190px;
	height: 2em;
	line-height: 2;
	background: #E9B6B0;
	overflow:auto	;
	border-radius: .35em;
	margin-bottom: 5px;

}
.dropdown select {
	-webkit-appearance: none;
	-moz-appearance: none;
	-ms-appearance: none;
	appearance: none;
	background-image: none; /* remove the value that chrome dose not use */
    background-color: #E9B6B0; /* set the value it does */
    border-radius: 4px;     /* make it look kinda like the background image */
    border: 1px solid #888;
	outline: 0;
	box-shadow: none;
	border: 0 !important;
	background: #E9B6B0;
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0 0 0 .5em;
	color: black;
	cursor: pointer;
	font-size: 15px;

}

.dropdown::after {
	content: '\25BE';
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	padding: 0 1em;
	background: #E9B6B0;
	pointer-events: none;
}

.dropdown:hover::after {
	color: white;
}
.dropdown::after {
	-webkit-transition: .25s all ease;
	-o-transition: .25s all ease;
	transition: .25s all ease;
}

<div class="dropdown">
	<select id="genre" onchange="filterConcerts()" value="default">
		<option value="default">Sjanger</option>
</div>