回答編集履歴
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追記
test
CHANGED
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@@ -35,3 +35,121 @@
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35
35
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ModalPopup Demonstration
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36
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[https://ajaxcontroltoolkit.devexpress.com/ModalPopup/ModalPopup.aspx](https://ajaxcontroltoolkit.devexpress.com/ModalPopup/ModalPopup.aspx)
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38
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39
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40
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41
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**【追記】**
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下の 2018/08/27 14:46 の私のコメントで「<div class="page"> を真ん中に持ってくるので良ければ CSS でできると思います。回答欄にサンプルを追記しておきます」と書きましたが、それを以下に書きます。
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46
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47
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48
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49
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これがこのまま質問者さんのケースに適用できるかまでは調べてませんが、直接は適用できなくても、応用でやりたいことは実現可能かと思います。
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50
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53
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```
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54
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55
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<%@ Page Language="C#" AutoEventWireup="true"
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CodeFile="0049-Centering.aspx.cs" Inherits="_0049_Centering" %>
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58
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59
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<!DOCTYPE html>
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62
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63
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64
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65
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<html xmlns="http://www.w3.org/1999/xhtml">
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66
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<head runat="server">
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68
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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70
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<title></title>
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<style type="text/css">
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74
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75
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body {
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76
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background: #555;
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}
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80
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81
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82
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83
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.content {
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84
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background: white;
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86
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width:500px;
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height:300px;
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90
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position:absolute;
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top:50%;
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left:50%;
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96
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margin-left:-250px;
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margin-top:-150px;
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overflow:scroll;
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}
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</style>
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</head>
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<body>
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110
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<form id="form1" runat="server">
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112
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<div class="content">
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114
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115
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<h1>This page is horizontally / vaerically centered on
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116
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screens that are wider than 500 / 300 pixels.</h1>
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118
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119
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<h2>Resize the browser window to see the effect.</h2>
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120
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121
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<p>An absolutely positioned element is an element whose computed position value is absolute or fixed.
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122
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123
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The top, right, bottom, and left properties specify offsets from the edges of the element's containing block.
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(The containing block is the ancestor relative to which the element is positioned.)
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126
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If the element has margins, they are added to the offset.</p>
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128
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</div>
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131
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</form>
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132
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</body>
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134
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135
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</html>
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136
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```
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結果は以下の通り。ブラウザは Chrome 68.0.3440.106 です。
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147
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148
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149
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css の position の説明については以下の記事を見てください。
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150
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152
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153
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position
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[https://developer.mozilla.org/en-US/docs/Web/CSS/position](https://developer.mozilla.org/en-US/docs/Web/CSS/position)
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