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<style>
.container {
display: flex;
flex-direction: column;
outline: 1px solid black;
}
.item {
border: 0px solid pink;
box-sizing: content-box;
}
.withBorderTop {
border-top-width: 20px;
}
</style>
<body>
<div class="container">
<xul:toolbarpaletteitem
class="item withBorderTop">abc</xul:toolbarpaletteitem>
<xul:toolbarpaletteitem
class="item">def</xul:toolbarpaletteitem>
<xul:toolbarpaletteitem
class="item">ghi</xul:toolbarpaletteitem>
</div>
</body>
</html>