.czerwony{
  background-color: red; /* Green */
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;

}
.zielony{
background-color: #4CAF50; /* Green */
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 20px;
margin: 4px 2px;
cursor: pointer;
}
.bialy{
  background-color: #white;
  border: 1px solid green;
  color: black;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
  margin: 4px 2px;
  cursor: pointer;
}
.ukryj{
  display: none;
}
.pokaz{
  display:block;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}

li {
  float: left;
}

li a, .dropbtn {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;

}

li a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}

li.dropdown {
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: relative;
  background-color: grey;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {background-color: #f1f1f1;}

.dropdown:hover .dropdown-content {
  display: block;
}
.active {
  background-color: #4CAF50;
}
.active:hover .dropdown-content {
  display: block;
}
a {display: block;
  color: White;
  width: 300PX;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  background-color: grey;}
footer{
    background-color: black;
    color: white;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
head{
  position: fixed;
  top: 0;
  left: 0;
  height: 50px;
  width: 100%;

}
.s1 {
  height: 90%;
  width: 30%;
  position: fixed;
  z-index: -1;
  top: 50px;
  overflow-x: hidden;
  left: 0px;
}
.s2 {
  height: 90%;
  width: 30%;
  position: fixed;
  z-index: -1;
  top: 50px;
  overflow-x: hidden;
  padding-top: 20px;
  left: 30%;
}
.s3 {
  height: 90%;
  width: 30%;
  position: fixed;
  z-index: -1;
  top: 50px;
  overflow-x: hidden;
  padding-top: 20px;
    left: 60%;
}

.centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

tr:nth-child(even) {
  background-color: #f2f2f2;
  border: 1px
}

tr:hover {background-color: #E6E6E6;}
td:hover input{display: block;}
td {min-width: 80px}