html, body {
  height: 100vh;  
  font-family: 'Roboto', sans-serif;
}

#header_image {     
  display: block;
  width: 100%;
  height: auto;
  padding: 0;
  object-fit: cover;
  filter: brightness(.6);
}

.form-control {
border-color: #999999;
}

h1 {
  font-size: 40px;
  font-weight:bolder;
}

#headline {
  margin-top: 0px;    
  margin-bottom: 0px;
  font-size: 50px;
  color: white;
}

h2 {
  padding-top: 20px;
  padding-bottom: 30px;
  font-weight:bold;
  font-size: 40px;
  text-transform: uppercase;
}

h3 {
  padding-top: 30px;
  padding-bottom: 20px;
  font-weight:bold;
  font-size: 22px;
}

h4 {
  padding-bottom: 20px;
  font-weight:bold;
  font-size: 20px;
}

#thumbnail {
  position: relative;
  display: inline-block;
}

.caption {  
    display: inline-block;    
    font-size: 150px;
    color: white;
    width: 1300px;
    height: 125px;
    padding: 20px 30px 20px 30px;     
    position: absolute;
    top: 55px;
    left: 50%;
    transform: translateX(-50%);
}

section {
  height: auto;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

section:nth-child(even) {
  background: #FFF
}

section:nth-child(odd) {
  background: #d4d4d4
}

.section-1 {
  padding-top: 0px;
  padding-bottom: 0px;
  display: block;
}

.section-1a {
  display: none;
}

#obrazec {
  margin-top: 2rem;
  margin-bottom: 3rem;
}

/* PLACEHOLDER */
::placeholder { /* Chrome, Firefox, Opera, Safari 10.1+ */
  color: black;
  opacity: 1; /* Firefox */
}  

:-ms-input-placeholder { /* Internet Explorer 10-11 */
  color: black;
}  

::-ms-input-placeholder { /* Microsoft Edge */
  color: black;
}

/* MODALs */
.modal-title {
  color: #D40320;
  font-weight: bold;
}

.modal-body a {
  text-decoration: none;
  color: #D40320;
}

/* BUTTON */
#button, #button1  {
  font-size: 13px;
  letter-spacing: 1px;
  height: 48px;
  padding: 10px 40px;
  margin-top: 1.25rem; 
  margin-bottom: 2rem;    
  background-color: #D40320;
  border: 1px solid #D40320;
  border-radius: 0px;
  color: #ffffff;
}

/* MEDIA QUERIES */
@media (max-width: 767.98px) {
  h1 {
      margin-top: 1rem;
      margin-bottom: 1.5rem;
      font-size: 2rem;
      color: black;
  }

  #button, #button1  {
      font-size: 11px;
  }

  #logo {
      height: 50%;
  }    
  .caption {        
      display: none;  
  }
  
  .section-1a {
      display: block;      
      padding: 0px;
      margin: 0px;        
  }
  .reposition1 {
      color: black;      
      padding: 5px;     
  }

  #headline-mini {
      margin-top: 1rem;
      margin-bottom: 1.5rem;
      font-size: 2rem;        
  }
}

// Medium devices (tablets, less than 992px)
@media screen and (max-width: 991.98px) {       
  h1 {
      margin-top: 1rem;
      margin-bottom: 1.5rem;
      font-size: 2rem;
      color: black;
  }

  #button, #button1  {
      font-size: 11px;
  }

  #logo {
      height: 50%;
  }    

  .caption {        
      display: none;  
  }
  
  .section-1a {
      display: block;      
      padding: 0px;
      margin: 0px;        
  }

  .reposition1 {
      color: black;      
      padding: 5px;
  }
  #headline-mini {
      margin-top: 1rem;
      margin-bottom: 1.5rem;
      font-size: 2rem;        
  }    
}

// Large devices (desktops, less than 1200px)
@media (max-width: 1199.98px) { ... }