表中的下拉框按钮 css样式

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咱群里大神写的这段代码怎么改？（不会上传附件,代码如下)

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::-webkit-scrollbar {
width: .5rem;
height: .5rem;
}

::-webkit-scrollbar-thumb {
background-color: rgba(95, 95, 95, .2);
border-radius: .5rem;
transition: all .8s;
}

::-webkit-scrollbar-thumb:hover {
background-color: rgba(95, 95, 95, .7);
}

:root {
--icon-corner: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAADlJREFUOE9jZKAQMFKon2EIGhAXF/d/0aJFcJfTzwswm+nvAnSb6ecCXDbT3gWEbKa9C0jNXBSnRADzyTwRbYW38wAAAABJRU5ErkJggg==);
--icon-downarrow: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAIVJREFUOE/dkzEOgCAQBF34g4kPgwrC0wihg3/Z+IgzGEkAwUI6qXfnls0dlsmHSf/yJ4BSamOM7UQkvfex143WWgAInPPVWnskTdWBMSYQkehBshlAdM7JPOBRYg8yMj8SZGoJuURAaCcPE7SQG1DFLvt53YOUJInLP7fl/mmRvh7VdAcnzmdFEah8J2AAAAAASUVORK5CYII=);
}

[class*=ForguncyDropDownListCellType] .gcim-icon_drop-down,
[class*=ForguncyTimeCellType] .gcim-icon_drop-down {
background-image: var(--icon-downarrow);
background-size: 12px;
}

.gcim-dropdown-down {
box-shadow: 2px 6px 10px -9px #00000080;
}

.gcim-dropdown-down .gcim__listbox {
border: #e9e9e9 solid 1px;
background-color: white;
border-radius: 4px;
margin-top: 0px;
}

.gcim-dropdown-down .viewport .list-item {
width: 100%;
font-weight: 300;
color: #666666;
border-bottom: 1px solid #e9e9e9;
transition: background-color .2s;
}

.gcim-dropdown-down .viewport .list-item:hover {
background-color: #f4f4f4;
}

.gcim-dropdown-down .viewport .list-item[selected=true] {
background-color: #f4f4f4;
color: #666666;
font-weight: 500 !important;
}

.gcim-dropdown-down .corner[resize="true"] {
opacity: 0;
transition: opacity .2s;
background-image: var(--icon-corner);
background-size: 100%;
}

.gcim-dropdown-down .corner[resize="true"]:hover {
opacity: 1;
}