.form_login
{
  width: 500px;
  margin: auto;
}

.div_stred_login
{
  margin: auto;
  margin-top: 50px;
  max-width: 500px;
  background: #ffffff;
}

.div_stred_login #taby
{
  overflow: hidden;
  border: 1px solid #0E4194;
  background-color: #0E4194;
}

.div_stred_login #taby button
{
  background-color: #0E4194;
  color: #ffffff;
  font-weight: bold;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
}

/* Change background color of buttons on hover */
.div_stred_login #taby button:hover
{
  background-color: #21cde8;
}

/* Create an active/current tablink class */
.div_stred_login #taby button.active
{
  background-color: #0e41FF;
}

.div_stred_login .tabcontent
{
  display: none;
  padding: 0px;
  border: 1px solid #ccc;
  border-top: none;
  background: #ffffff;
}

.centrovany_na_strance
{
  width: 600px;
  height: 200px;

  position:absolute; 
  left:0; right:0;
  top:0; bottom:0;
  margin:auto;

  max-width:100%;
  max-height:100%;
  overflow:auto;
  background: rgba(106, 106, 106, 0.8);
}