input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}

body {
  background-color: #2e9afe;
  -ms-user-select: None;
  -moz-user-select: None;
  -webkit-user-select: None; 
}

a {
  font-family: Arial,Helvetica,sans-serif;
  font-weight: inherit;
  color: white;
  text-decoration: none;
}
a:active {
  font-family: Arial,Helvetica,sans-serif;
  font-weight: inherit;
  color: white;
  text-decoration: none;
}
a:visited {
  color: white;
  font-family: Arial,Helvetica,sans-serif;
  text-decoration: none;
  font-weight: inherit;
}
a:hover {
  color: #ffff00;
  font-family: Arial,Helvetica,sans-serif;
  font-weight: inherit;
  text-decoration: none;
}
#menu {
  position: absolute;
  font-size: 1.8em;
  margin-top: 200px;
  margin-left: 100px;
  line-height: 1.8em;
  z-index: 5;
}

#uebung {
  font-family: Arial;
  margin-left: 14px;
  position: absolute;
  width: 800px;
  height: 600px;
  background-color: #0066ff;
  left: 50%;
  margin-top: 50px;
  margin-left: -400px;
}

#titel {
  font-weight: bold;
  color:#ffff00;
  font-size: 2.5em;
  position: absolute;
  margin-top: 75px;
  margin-left: 50px;
}

#grafik {
  background-image: url(../img/delfin.png);
  background-position:  center center;
  position: absolute;
  width: 200px;
  height: 128px;
  margin-top: 40px;
  margin-left: 550px;
  z-index: 1;
}

#zurueck {
  margin-top: 536px;
  font-size: 1.3em;
  margin-left: 684px;
  position: absolute;
  font-weight: bold;
}
#copyright {
  position: absolute;
  width: 200px;
  margin-top: 570px;
  margin-left: 300px;
  font-size: 0.9em;
  text-align: center;
}
#basisinfo {
  font-family: Arial;
  position: absolute;
  width: 800px;
  height: 50px;
  margin-top: 610px;
}
#username {
  font-family: Arial;
  position: absolute;
  width: 250px;
  height: 50px;
  color:red;
}
#uebungslink {
  font-family: Arial;
  position: absolute;
  width: 250px;
  height: 50px;
  margin-left: 275px;
  text-align: center;
}
#logout {
  font-family: Arial;
  position: absolute;
  width: 250px;
  height: 50px;
  margin-left: 550px;
  text-align: right;
}