<asp:Button ID="Button1" runat="server" Text="Button" onclientclick='redirect()' />

function redirect() {
  location.href = 'page.aspx';
}

.button {
  display: block;
  height: 25px;
  background: #f1f1f1;
  padding: 10px;
  text-align: center;
  border-radius: 5px;
  border: 1px solid #e1e1e2;
  color: #000;
  font-weight: bold;
}

<a runat="server" Id="lnkBack">Back</a>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
       lnkBack.Attributes.Add("href", url);
    }
}

<a id="ctl00_ctl00_mainContentPlaceHolder_contentPlaceHolder_lnkBack"
      href="url.aspx">Back</a>

<asp:LinkButton runat="server" id="SomeLinkButton" href="url" CssClass="btn btn-primary btn-sm">Button Text</asp:LinkButton>

<a id="MainContent_ctl00_SomeLinkButton" class="btn btn-primary btn-sm" href="url" href="javascript:__doPostBack(&#39;ctl00$MainContent$ctl00$lSomeLinkButton&#39;,&#39;&#39;)">Button Text</a>

<asp:Button ID="Button1" runat="server" Text="Name of web location" PostBackUrl="web address" />