基于全屏宽度大小

Question

  <div class="jumbotron text-center">
    <h1>Full Width Layout</h1>
    <p class="lead">The Bootstrap 3 grid is fluid only. This example shows how to use a custom container to create a fixed width layout.</p>
    <p><a class="btn btn-large btn-success" href="http://bootply.com/tagged/bootstrap-3" target="ext">More Examples</a></p>

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1）我试图将输入框居中，旁边有提交按钮。 2）当我调整浏览器窗口的大小时，输入框会缩小，我该如何防止这种情况发生。感谢