Css没有正确格式化div

Question

我正在我的代码中运行存储过程，我想要实现的是一个在页面左侧有一个大图像，然后在右边有4-5个较小图像的表。我先设置较大的图像，然后再运行较小的图像。我的问题是图像的对齐。较小的图像不想正确堆叠，然后下一个较大和较小图像的rom正在倾斜。请参阅下面的代码。

Dim table1 As New HtmlTable

Dim numells As Integer = 6


dv = New DataView(dt1.Tables(0))
Dim tablestring = ""



Dim strTable As New StringBuilder()
Dim rowIsOpen As Boolean = False
Dim itmCounter As Integer = 0
strTable.Append("<div class=table3test>")



For Each dr As DataRowView In dv



    Dim crossover As String = dr("ID").ToString()
    Dim picid As String = dr("StyleName").ToString()
    Dim picdescrip As String = dr("StyleNumber").ToString().ToUpper()
    Dim collectionname As String = dr("Collection").ToString()
    Dim designinfo As String = dr("GroupName").ToString()
    Dim mainimage As String = dr("RoomScene").ToString

    Session("Collection") = collectionname

    If itmCounter = 0 Then
        If mainimage = "Yes" Then

            strTable.Append("" & collectionname & " Collection</br>")
            strTable.Append("<div class=celltest7><a class=hyperlink     href=""Sheet-Vinyl-Tile-Product-Page.aspx?p=" & crossover & "&o=" & designinfo & """>")
            strTable.Append("<img src=""Images/Main/" + picdescrip + " " + picid + ".jpg""width=""400"" height=""400"" border=""0"""" /><br/>")
            strTable.Append("<div class=backgroundcolor>" & picdescrip + " " + collectionname & "")
            strTable.Append("</a></div></div>")

        Else

        End If
      End If

     `enter code here`  If itmCounter <> 0 Then
            If testtable <> collectionname Then
                strTable.Append("</br></br>")
                If mainimage = "Yes" Then

                strTable.Append("" & collectionname & " Collection</br>")
                strTable.Append("<div class=celltest7><a class=hyperlink href=""Sheet-Vinyl-Tile-Product-Page.aspx?p=" & crossover & "&o=" & designinfo & """>")
                strTable.Append("<img src=""Images/Main/" + picdescrip + " " + picid + ".jpg""width=""400"" height=""400"" border=""0"""" /><br/>")
                strTable.Append("<div class=backgroundcolor>" & picdescrip + " " + collectionname & "")
                strTable.Append("</a></div></div>")

            Else

                End If

            Else


            End If
        End If






    If itmCounter Mod 3 = 0 Then

        rowIsOpen = True
    End If


    strTable.Append("<div class=celltestpublic1><div class=celltestpublic><a class=hyperlink href=""Sheet-Vinyl-Tile-Product-Page.aspx?p=" & crossover & "&o=" & designinfo & """>")
    strTable.Append("<img src=""Images/Swatches/" + picdescrip + " " + picid + ".jpg""width=""200"" height=""200"" border=""0"""" /><br/></div>")
    strTable.Append("<div class=backgroundcolor>" & picdescrip + " " + collectionname & "")
    strTable.Append("</a></div></div>")


    itmCounter += 1

    testtable = Session("Collection")

Next
strTable.Append("</div>")
product.InnerHtml = strTable.ToString()

con5.Close()

CSS

.celltest7 {
    width:   30%;
    float: left;
    margin-right: 20px;
    margin-bottom: 40px;
    border: 8px solid white;
    box-shadow: 0px 0px 5px #888888;
}
.celltestpublic {
    width: 70%;  

}
.celltestpublic1
{
    float: left;
    width:  200px;
    margin-right: 10px;
    /*margin-bottom: 15px;*/
}
.table3test
{
    width: 100%;
    }