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I adopted sfdcfox's answer, lightening the mask opacity, adding a white background window and text. I also used the Salesforce provided loading.gif.

Here's the final result:

Here's the code:

<apex:actionStatus id="status">
    <apex:facet name="start">
    <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.25; z-index: 1000; background-color: black;">
        &nbsp;
    </div>
    <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 15% 50%">
        <div style="display: inline-block; padding: 2px; background-color: #fff; width: 125px;">
            <img src="/img/loading.gif" style="float: left; margin: 8px;" />
            <span style="display: inline-block; padding: 10px 0px;">Please Wait...</span>
        </div>
    </div>
    </apex:facet>
</apex:actionStatus>

Adjust the margin in the second div margin: 15% 50% to position the popup where you want.

I adopted sfdcfox's answer, lightening the mask opacity, adding a white background window and text. I also used the Salesforce provided loading.gif.

Here's the final result:

Here's the code:

<apex:actionStatus id="status">
    <apex:facet name="start">
    <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.25; z-index: 1000; background-color: black;">
        &nbsp;
    </div>
    <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 15% 50%">
        <div style="display: inline-block; padding: 2px; background-color: #fff; width: 125px;">
            <img src="/img/loading.gif" style="float: left; margin: 8px;" />
            <span style="display: inline-block; padding: 10px 0px;">Please Wait...</span>
        </div>
    </div>
    </apex:facet>
</apex:actionStatus>

Adjust the margin in the second div margin: 15% 50% to position the popup where you want.

I adopted sfdcfox's answer, lightening the mask opacity, adding a white background window and text. I also used the Salesforce provided loading.gif.

Here's the final result:

Here's the code:

<apex:actionStatus id="status">
    <apex:facet name="start">
    <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.25; z-index: 1000; background-color: black;">
        &nbsp;
    </div>
    <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 15% 50%">
        <div style="display: inline-block; padding: 2px; background-color: #fff; width: 125px;">
            <img src="/img/loading.gif" style="float: left; margin: 8px;" />
            <span style="display: inline-block; padding: 10px 0px;">Please Wait...</span>
        </div>
    </div>
    </apex:facet>
</apex:actionStatus>

Adjust the margin in the second div margin: 15% 50% to position the popup where you want.

I adopted sfdcfox's answer, lightening the mask opacity, adding a white background window and text. I also used the Salesforce provided loading.gif.

Here's the final result:

Here's the code:

<apex:actionStatus id="status">
    <apex:facet name="start">
    <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.25; z-index: 1000; background-color: black;">
        &nbsp;
    </div>
    <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 15% 50%">
        <div style="display: inline-block; padding: 2px; background-color: #fff; width: 125px;">
            <img src="/img/loading.gif" style="float: left; margin: 8px;" />
            <span style="display: inline-block; padding: 10px 0px;">Please Wait...</span>
        </div>
    </div>
    </apex:facet>
</apex:actionStatus>

Adjust the margin in the second div margin: 15% 50% to position the popup where you want.

A adopted sfdcfox's answer, lightening the mask opacity, adding a white background window and text. I also used the Salesforce provided loading.gif.

Here's the final result:

Here's the code:

<apex:actionStatus id="status">
    <apex:facet name="start">
    <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.25; z-index: 1000; background-color: black;">
        &nbsp;
    </div>
    <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 15% 50%">
        <div style="display: inline-block; padding: 2px; background-color: #fff; width: 125px;">
            <img src="/img/loading.gif" style="float: left; margin: 8px;" />
            <span style="display: inline-block; padding: 10px 0px;">Please Wait...</span>
        </div>
    </div>
    </apex:facet>
</apex:actionStatus>

Adjust the margin in the second div margin: 15% 50% to position the popup where you want.

I adopted sfdcfox's answer, lightening the mask opacity, adding a white background window and text. I also used the Salesforce provided loading.gif.

Here's the final result:

Here's the code:

<apex:actionStatus id="status">
    <apex:facet name="start">
    <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.25; z-index: 1000; background-color: black;">
        &nbsp;
    </div>
    <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 15% 50%">
        <div style="display: inline-block; padding: 2px; background-color: #fff; width: 125px;">
            <img src="/img/loading.gif" style="float: left; margin: 8px;" />
            <span style="display: inline-block; padding: 10px 0px;">Please Wait...</span>
        </div>
    </div>
    </apex:facet>
</apex:actionStatus>

Adjust the margin in the second div margin: 15% 50% to position the popup where you want.