Call sub or function from aspx, HTML

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ASP

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VBA

Hi, I use a css style for buttons, how can I call Sub or function after click on this button? (buttonman). I tried call image button which now I use on click method, but not function. Or how can I call

GridView7.BorderColor = Color.Tomato

after click on button "butonman"?. Thank you

aspx:

<button class="buttonman" type="button" style="vertical-align:middle; position: absolute;left: 10px;"> <span>Management </span>

VB sub:

Protected Sub ImageButton1_Click(sender As Object, e As ImageClickEventArgs) Handles
GridView7.BorderColor = Color.Tomato
End Sub

CSS:

.buttonman {
    border-style: none;
    border-color: inherit;
    border-width: 1px;
    display: inline-block;
    border-radius: 4px;
    background-color: #f4511e;
    color: #FFFFFF;
    text-align: center;
    font-size: 26px;
    width: 230px;
    padding: 15px;
    transition: all 0.5s;
    cursor: pointer;
    margin: 5px;
    top: 280px;
}

    .buttonman span {
        cursor: pointer;
        display: inline-block;
        position: relative;
        transition: 0.5s;
   
}

        .buttonman span:after {
            content: '\00bb';
            position: relative;
            opacity: 0;
            top: 0;
            right: -20px;
            transition: 0.5s;
        }

    .buttonman:hover span {
        padding-right: 25px;
    }

        .buttonman:hover span:after {
            opacity: 1;
            right: 0;
        }

What I have tried:

I tried to

Protected Sub ImageButton1_Click(sender As Object, e As ImageClickEventArgs) Handles buttonman.click

but not support.

and:

I tried script:

<button class="buttonman" type="button" style="vertical-align:middle; position: absolute;left: 10px;">
<span>Management </span>

<script>                                            document.getElementById('ImageButton1').click();
</script>