Found a simple solution: I suppressed the vertical scrollbar with this code before the page layout HTML on each page that has the redirection code after the page code:
<span class=”tagcolor”><span lang=”NL” style=”font-size:11.5pt;
line-height:107%;font-family:Consolas;color:mediumblue”><!DOCTYPE<span lang=”NL” style=”font-size:11.5pt;line-height:107%;
font-family:Consolas;color:red”>?html></span></span>
<span lang=”NL” style=”font-size:11.5pt;line-height:107%;font-family:Consolas;color:mediumblue”><<span lang=”NL” style=”font-size:11.5pt;line-height:107%;font-family:Consolas;
color:brown”>html<span lang=”NL” style=”font-size:11.5pt;line-height:107%;
font-family:Consolas;color:mediumblue”>></span></span></span>
<span lang=”NL” style=”font-size:11.5pt;line-height:107%;font-family:Consolas;color:mediumblue”><<span lang=”NL” style=”font-size:11.5pt;line-height:107%;font-family:Consolas;
color:brown”>head<span lang=”NL” style=”font-size:11.5pt;line-height:107%;
font-family:Consolas;color:mediumblue”>></span></span></span>
<span lang=”NL” style=”font-size:11.5pt;line-height:107%;font-family:Consolas;color:mediumblue”><<span lang=”NL” style=”font-size:11.5pt;line-height:107%;font-family:Consolas;
color:brown”>style<span lang=”NL” style=”font-size:11.5pt;line-height:107%;
font-family:Consolas;color:mediumblue”>></span></span></span></span>
<span lang=”NL” style=”font-size: 11.5pt; line-height: 107%; font-family: Consolas; color: brown; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;”>body?<span lang=”NL” style=”font-size: 11.5pt; line-height: 107%; font-family: Consolas; color: black; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;”>{</span>
<span class=”csspropertycolor”>? overflow-y<span lang=”NL” style=”font-size: 11.5pt; line-height: 107%; color: black; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;”>:?hidden<span lang=”NL” style=”font-size: 11.5pt; line-height: 107%; color: black; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;”>;</span>?<span lang=”NL” style=”font-size: 11.5pt; line-height: 107%; color: green; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;”>/* Hide vertical scrollbar */</span></span>
<span lang=”NL” style=”font-size: 11.5pt; line-height: 107%; color: black; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;”>}</span></span></span>
<span class=”tagcolor”><span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;
color:mediumblue”></style<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:mediumblue”>></span></span>
<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:mediumblue”><<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:brown”>/head<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:mediumblue”>></span></span></span>
<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:mediumblue”><<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:brown”>/html<span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;color:mediumblue”>></span></span></span></span>
Perhaps crude but it does the job
<span class=”tagcolor”><span lang=”NL” style=”font-size:11.5pt;font-family:Consolas;
color:mediumblue”>?</span></span>