html {
    background-color: #e6e9e9;
    background-image: -webkit-linear-gradient(270deg,rgb(230,233,233) 0%,rgb(216,221,221) 100%);
    background-image: linear-gradient(270deg,rgb(230,233,233) 0%,rgb(216,221,221) 100%);
    -webkit-font-smoothing: antialiased;
}

body {

    margin: 0 auto;
    padding: 2em 2em 4em;
    max-width: 980px;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 1em;
    line-height: 1.3em;
    color: #545454;
    background-color: #ffffff;
<!--    box-shadow: 0 0 2px rgba(0, 0, 0, 0.06); -->
}

h1, h2, h3, h4, h5, h6 {
    color: #222;
    font-weight: 400;
    line-height: 1.3em;
    text-align: center;
}

h1 {
    font-size: 2.2em;
}

h2 {
    margin-top: 1.3em;
}

a {
    color: #0083e8;
}

b, strong {
    font-weight: 600;
}

footer {
    font-size: 0.7em;
    line-height: 1.3em;
    text-align: center;
}

hr {
    border:none;
    height:2px; 
    background-color: #D4D4D4;
}

#logo {

	padding: 5px 15px;
    display: none;
}

#topic {

    background-image: url("Logo_Prueckner_Tragwerksplanung.png");
    background-repeat: no-repeat;
    <!--  float: left; -->
}

#subtopic {
    float: center;
}

#maincontent {
    float: center;
    text-align: center;
}

.h1-sub {
    font-size: 0.8em;
}


#pagewrap, #logo, #topic, #subtopic, #maincontent {
	border: solid 1px #ffffff;
}


/************************************************************************************
MEDIA QUERIES
*************************************************************************************/
/* for 900px or less */
@media screen and (max-width: 900px) {
	
	#pagewrap {
		width: 94%;
	}
	#logo {
        display: block;
        text-align: center;
	}
	#topic {
        background-image: none;
	}

}