* {
  box-sizing: border-box;
}
body {
  margin: 0;
 /* background-image:url('bg_dig.jpeg');
  background-size:auto;
  background-size: cover;*/
  background: #2980b9;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #2c3e50, #2980b9);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #2c3e50, #2980b9); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */

}

.kopf{
  width:100%;
  height:auto;
  padding:50px 20px;
  font-family:Helvetica, sans-serif;
  font-size:2.5em;
  font-weight:600;
  color: white;
  text-align:center;
}

.container{
  width: 100%;
}

a {
  text-decoration: none;
  color: white;
}
.menubox{
  background: rgba(0,0,0,0.4);
  width: 60%;
  min-height: 500px;
  border-radius: 8px;
  margin: auto;
  padding: 50px;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
}

.link_button{
  background: rgba(0,0,0,0.4);
  width: 250px;
  height: 110px;
  border-radius: 5px;
  text-align:center;
  margin: 15px;
  font-family:Helvetica, sans-serif;
  font-size:1.2em;
  font-weight:600;
  color: white;
  line-height: 110px;
}

.link_button:hover{
  background: rgba(255,255,255,0.2);
    font-size:1.4em;
}
/*
.link_button a{
  font-family:Helvetica, sans-serif;
  font-size:1.2em;
  font-weight:600;
  color: white;
  line-height: 110px;
}
*/