Ohman, ich habe weder „views/storefront/page/content/single-page.html.twig“ noch finde ich diese Seiten nicht über FTP.
Ich habe das Standard-Thema. Wo müsste den die Datei unter FTP sein?
Unter /public/theme/1aaa383f7a130c8a85f249e93d83f34f → da sind 23 Kategorien „2f4b9c9418823da6dee3770c63709027“, usw. drin, und diese weisen css und js auf!
Wahrscheinlich bin ich da völlig falsch! 
Und ja, ich habe schon einige ausgewählt und gespeichert, cache entfernt usw.!
Das ist doch der Bereich unter /public/maintenance.html??
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Wartungsmodus</title>
<style>
article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}audio,canvas,video{display:inline-block}audio:not([controls]){display:none;height:0}[hidden]{display:none}html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}a:focus{outline:thin dotted}a:active,a:hover{outline:0}h1{font-size:2em;margin:.67em 0}abbr[title]{border-bottom:1px dotted}b,strong{font-weight:700}dfn{font-style:italic}hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0}mark{background:#ff0;color:#000}code,kbd,pre,samp{font:1em monospace,serif}pre{white-space:pre-wrap}q{quotes:"\201C" "\201D" "\2018" "\2019"}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}img{border:0}svg:not(:root){overflow:hidden}figure{margin:0}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}legend{border:0;padding:0}button,input,select,textarea{font-family:inherit;font-size:100%;margin:0}button,input{line-height:normal}button,select{text-transform:none}button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0}input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}textarea{overflow:auto;vertical-align:top}table{border-collapse:collapse;border-spacing:0}
body, html { min-height: 100%; background: #e9ebed; }
.maintenance-container {
position: relative;
background: #fff;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
margin: 50px auto;
width: 475px;
padding: 30px;
text-align: center;
-webkit-box-shadow: 0px 1px 3px rgba(0, 0, 0, .5);
-moz-box-shadow: 0px 1px 3px rgba(0, 0, 0, .5);
-ms-box-shadow: 0px 1px 3px rgba(0, 0, 0, .5);
box-shadow: 0px 1px 3px rgba(0, 0, 0, .5);
}
.maintenance-headline {
font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
font-weight: 300;
margin: 0 0 .8em;
}
.maintenance-text { font-size: 13px }
.maintenance-progress {
border-top: 1px solid #529e52;
height: 4px; width: 100%;
position: absolute;
bottom: 0; left: 0;
background-color: #5eb95e;
-webkit-background-size: 40px 40px;
-moz-background-size: 40px 40px;
-o-background-size: 40px 40px;
background-size: 40px 40px;
-webkit-animation: progress-bar-stripes 2s linear infinite;
-moz-animation: progress-bar-stripes 2s linear infinite;
-ms-animation: progress-bar-stripes 2s linear infinite;
-o-animation: progress-bar-stripes 2s linear infinite;
animation: progress-bar-stripes 2s linear infinite;
background-color: #62C462;
background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(0.25, rgba(255, 255, 255, 0.15)), color-stop(0.25, rgba(0, 0, 0, 0)), color-stop(0.5, rgba(0, 0, 0, 0)), color-stop(0.5, rgba(255, 255, 255, 0.15)), color-stop(0.75, rgba(255, 255, 255, 0.15)), color-stop(0.75, rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, rgba(0, 0, 0, 0) 25%, rgba(0, 0, 0, 0) 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, rgba(0, 0, 0, 0) 75%, rgba(0, 0, 0, 0));
background-image: -moz-linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, rgba(0, 0, 0, 0) 25%, rgba(0, 0, 0, 0) 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, rgba(0, 0, 0, 0) 75%, rgba(0, 0, 0, 0));
background-image: -o-linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, rgba(0, 0, 0, 0) 25%, rgba(0, 0, 0, 0) 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, rgba(0, 0, 0, 0) 75%, rgba(0, 0, 0, 0));
background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, rgba(0, 0, 0, 0) 25%, rgba(0, 0, 0, 0) 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, rgba(0, 0, 0, 0) 75%, rgba(0, 0, 0, 0));
}
hr {
background: transparent url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAECAYAAACtBE5DAAAAHUlEQVR42q3IoREAAACCQHdy/91IFrLcfSGqc5wAdFYCZQo/LFUAAAAASUVORK5CYII=") repeat-x;
border: 0 none;
color: #CCC;
height: 4px;
padding: 0;
margin: 30px 0;
}
@-webkit-keyframes progress-bar-stripes {
from {
background-position: 40px 0;
}
to {
background-position: 0 0;
}
}
@-moz-keyframes progress-bar-stripes {
from {
background-position: 40px 0;
}
to {
background-position: 0 0;
}
}
@-ms-keyframes progress-bar-stripes {
from {
background-position: 40px 0;
}
to {
background-position: 0 0;
}
}
@-o-keyframes progress-bar-stripes {
from {
background-position: 0 0;
}
to {
background-position: 40px 0;
}
}
@keyframes progress-bar-stripes {
from {
background-position: 40px 0;
}
to {
background-position: 0 0;
}
}
</style>
</head>
<body>
<div class="maintenance-container">
<h1 class="maintenance-headline">Unsere Website befindet sich gerade in der Wartung.</h1>
<p class="maintenance-text">
Wir stehen Ihnen bald wieder zur Verfügung. Entschuldigen Sie etwaige Unannehmlichkeiten.
</p>
<hr />
<h1 class="maintenance-headline">Our website is currently undergoing maintenance.</h1>
<p class="maintenance-text">
We'll be back very soon. Sorry for any inconvenience.
</p>
<div class="maintenance-progress"></div>
</div>
</body>
</html>