/* Ensure proper sizing */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial,serif,sans-serif,Helvetica;
}

/* Style the header */
.header {
  padding: 20px;
  text-align: center;
  background: #b2e5d2;
  color:black;

}
.header a:link,.header a:visited {
  font-size: 30px;
  text-decoration: none;
  color: green;
}

.header a:hover,.header a:active{

  color: red;
}


/*Stule navbar*/
.topnav {
  overflow: hidden;

  background-color: rgb(228, 228, 174);
}

.topnav a {
  float: left;
  display: block;
  color: black;
  background-color: #b2e5d2;
  text-align: center;
  border: 2px solid black;
  border-radius: 12px;
  padding: 14px 16px;
  margin: 10px;
  text-decoration: none;
  font-size: 20px;
}

/* Right-aligned link */
.topnav a.right {
  float: right;
}

.topnav a:hover {
  background-color: grey;
  color: black;
}

.topnav a.active {
  background-color: green;
  color: white;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 800px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 800px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}

.menuicon {
  width: 15px;
  height: 3.5px;
  background-color: black;
  margin: 3px 0;
}




/* Footer */
.footer {
  padding: 20px;
  text-align: center;
  background: whitesmoke;
}

/*Platz für Artickel*/
.content {
  max-width: 90%;
  margin: auto;
  background: white;
  padding: 10px;
  font-size: 20px;
}


/* Main column auch Artickel*/
.main {
  background-color: white;
  padding: 20px;
}

.clearfix:after {
  content: "";
  display: table;
  clear: both;
}

.linkleiste a:link,.linkleiste a:visited {
  background-color: blue;
  color: white;
  border: 2px solid black;
  padding: 14px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  border-radius: 10px;
}
.linkleiste a:hover,.linkleiste a:active {
  background-color: green;
}
.linkunten {
  padding: 10px 10px;
  float: left;
  width: 33%;
}

.linkindex1 a:link, .linkindex1 a:visited{
  font-size: 30px;
  background-color: green;
  color: white;
  float: left;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 200px;
  height: 200px;
  border: 1px solid green;
  text-decoration: none;
  margin: 10px;
  border-radius: 10px;
}
.linkindex1 a:hover,.linkindex1 a:active {
  background-color: yellow;
  color: black;
}

.linkindex2 a:link, .linkindex2 a:visited{
  font-size: 30px;
  background-color: blue;
  color: white;
  float: left;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 200px;
  height: 200px;
  border: 1px solid ;
  text-decoration: none;
  margin: 10px;
  border-radius: 10px;
}
.linkindex2 a:hover,.linkindex2 a:active {
  background-color: yellow;
  color: black;
}


.formel{
  width: 100%;
  border: 4px solid Red;
  border-radius: 5px;
  padding: 5px;
  margin: 10px;
  background-color: white;
  float: left;
}

.link1 a:link, .link1 a:visited{
  font-size: 25px;
 color: blue;
  /*border: 1px solid green;*/
  text-decoration: none;
  padding: 5px;
  margin: 10px;
  border-radius: 8px;
}

.link1 a:hover,.link1 a:active {
  background-color: yellow;
  color: black;
  border: 1px solid black;
}