I made a Binary-Calculator site where I wanted the calc to be in a gray background, but the body was supposed to be black. So i made a black Body and a Div across all the elements i wanted do be in this gray background. Everything works fine on desktop but now where i started optimizing for mobile, i realized i have to "disable" the div which causes the gray background so have a clean black ui without that gray big backround line. When i test my @media querry on chromes simulated phone everything is positioned right and even the div background disapears. although when I test it on my phone it looks like in the pic. Thank you in advance.
@import url('https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@600&display=swap');
/*Desktop*/
@media only screen and (max-width: 2560px) {
body{
background-color:black;
}
h1{
font-family:Sans-serif;
font-size:60px;
text-decoration: underline black;
}
.background-box{
height:100vh;
width:60vw;
background-color: rgb(42, 42, 42);
margin:auto;
text-align:center;
}
.Dezi{
width:500px;
height:40px;
font-size:25px;
}
.rechnen{
font-family: 'Source Sans Pro', sans-serif;
font-size:20px;
height:70px;
width:400px;
background-color:white;
border-width:2px;
border-color:black;
border:solid;
border-width:2px;
box-shadow: inset 0 0 0 0 white;
transition:ease-out 0.8s;
}
.rechnen:hover{
cursor:pointer;
box-shadow:inset 700px 0 0 0 #000000;
color:white;
border-color:white;
}
#operator{
position:relative;
top:30px;
left:290px
}
.result{
font-family: 'Source Sans Pro', sans-serif;
font-size:25px;
}
.homebutton{
font-family: 'Source Sans Pro', sans-serif;
font-size:22px;
width:350px;
height:70px;
letter-spacing:2px;
color:black;
transition: ease-out 0.4s;
background-color:white;
float:right;
position:relative;
box-shadow:black;
border-color:rgb(0, 0, 0);
top:-935px;
box-shadow:inset 0 0 0 0 white;
border:solid;
}
.homebutton:hover {
cursor:pointer;
box-shadow:inset 350px 0 0 0 black;
color:white;
border-color:white;
border-width:2px;
}
.DzBR{
font-family: 'Source Sans Pro', sans-serif;
font-size:22px;
width:350px;
height:70px;
letter-spacing:2px;
color:black;
transition: ease-out 0.4s;
background-color:white;
float:right;
position:relative;
box-shadow:black;
border-color:rgb(0, 0, 0);
top:-870px;
left:350px;
box-shadow:inset 0 0 0 0 white;
border:solid;
}
.DzBR:hover{
cursor:pointer;
box-shadow:inset 350px 0 0 0 black;
color:white;
border-color:white;
border-width:2px;
}
}
/*MOBILE*/
@media only screen and (max-width: 850px) {
body{
all:unset;
background-color:white;
text-align:center;
}
h1{
font-family: 'Source Sans Pro', sans-serif;
font-size:60px;
text-decoration: underline black;
}
.background-box{
background-color: unset;
background-color: white;
}
.Dezi{
width:500px;
height:40px;
font-size:25px;
}
.rechnen{
font-family: 'Source Sans Pro', sans-serif;
font-size:20px;
height:70px;
width:400px;
background-color:white;
border-width:2px;
border-color:black;
border:solid;
border-width:2px;
box-shadow: inset 0 0 0 0 white;
transition:ease-out 0.8s;
}
.rechnen:hover{
cursor:pointer;
box-shadow:inset 700px 0 0 0 #000000;
color:white;
border-color:white;
}
#operator{
}
.result{
font-family: 'Source Sans Pro', sans-serif;
font-size:25px;
}
.homebutton{
all:unset;
all:revert;
font-family: 'Source Sans Pro', sans-serif;
font-size:22px;
width:350px;
height:70px;
letter-spacing:2px;
color:black;
transition: ease-out 0.4s;
background-color:white;
float:;
position:relative;
box-shadow:black;
border-color:rgb(0, 0, 0);
top:;
box-shadow:inset 0 0 0 0 white;
border:solid;
}
.homebutton:hover {
cursor:pointer;
box-shadow:inset 350px 0 0 0 black;
color:white;
border-color:white;
border-width:2px;
}
.DzBR{
all:unset;
font-family: 'Source Sans Pro', sans-serif;
font-size:22px;
width:350px;
height:70px;
letter-spacing:2px;
color:black;
transition: ease-out 0.4s;
background-color:white;
float:;
position:relative;
box-shadow:black;
border-color:rgb(0, 0, 0);
top:;
left:;
box-shadow:inset 0 0 0 0 white;
border:solid;
}
.DzBR:hover{
cursor:pointer;
box-shadow:inset 350px 0 0 0 black;
color:white;
border-color:white;
border-width:2px;
}
}<html>
<head>
<link href="DzBRstyle.css" rel="stylesheet" type="text/css">
<title>Dezimal zu Binär Rechner</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0">
</head>
<div class="background-box">
<body>
<h1>Dezimal zu Binär Rechner</h1>
<br>
<br>
<br>
<br>
<br>
<br>
<form action="DzBR.php" method="post">
<select id="operator" name="operator">
<option>Dual</option>
<option>Oktal</option>
<option>Hexal</option>
</select>
<br>
<input class="Dezi" name="Dezi" type="number">
<br>
<br>
<button name="rechnen" class="rechnen">Rechnen</button>
</form>
</div>
<form action="../hub.php">
<button class="homebutton">Home</button>
</form>
<form action="../Binaer-Dezimal/kayedrechner.php">
<button class="DzBR">Binär zu Dezimal Rechner</button>
</form>
</body>
</html>>Solution :
Put that background-box div into the body (not before it) and close it properly (with a </div> tag), then apply display: none; to it where needed (i.e. in a media query).