css使按钮固定在界面上面

<div><div style="border-bottom: 1px solid #e7e7e7"><a class="" onclick="saveTable()" style="margin-left: 2%"><i class=""></i>保存</a><a class="" onclick="sendTable()"><i class=""></i>发送</a></div></div><div class="scroll"></div>
</div>

.scroll{width: 1000px;height: 85%;overflow-x: hidden;overflow-y: auto;
}