body {
  font-family: Arial;
  padding: 20px;
  background: #f1f1f1;
}

.header {
  padding: 30px;
  font-size: 40px;
  text-align: center;
  background-size: 100%;
  background-position: center;
  border-style: double;
  background-color: rgb(221, 134, 63);
}

.overlay {
  height: 100%;
  width: 0;
  position: fixed; 
  z-index: 1; 
  left: 0;
  top: 0;
  background-color: rgb(0,0,0); 
  background-color: rgba(0,0,0, 0.9); 
  overflow-x: hidden; 
  transition: 0.5s; 
}

.overlay-content {
  position: relative;
  top: 25%; 
  width: 100%;
  text-align: center; 
  margin-top: 30px;
}

.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #818181;
  display: block; 
  transition: 0.3s; 
}

.overlay a:hover, .overlay a:focus {
  color: #f1f1f1;
}


.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

* {
  box-sizing: border-box;
}

.button-menu {
  border-radius: 4px;
  background-color: #555;
  border: none;
  color: #FFFFFF;
  text-align: center;
  font-size: 28px;
  padding: 20px;
  width: 200px;
  transition: all 0.5s;
  cursor: pointer;
  margin: 5px;
}

.button-menu span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}

.button-menu span:after {
  content: '\00bb';
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
  transition: 0.5s;
}

.button-menu:hover span {
  padding-right: 25px;
}

.button-menu:hover span:after {
  opacity: 1;
  right: 0;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.container img {
  max-width: 100%;
  max-height: auto;
  height: 450px;
  width: 450px;
  padding-bottom: 10px;
}


.leftcolumn {
  float: left;
  width: 75%;
}

.rightcolumn {
  float: left;
  width: 25%;
  padding-left: 20px;
}

.card {
  background-color: white;
  padding: 20px;
  margin-top: 20px;
  text-align: center;
}

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

.footer {
  padding: 20px;
  text-align: center;
  background: rgb(221, 134, 63);
  margin-top: 20px;
  border-style: double;
}

.hidden {
  display: none;
}

#btnToggle {
  border-radius: 4px;
  background-color: #555;
  border: none;
  color: #FFFFFF;
  text-align: center;
  font-size: 20px; 
  padding: 10px 20px;
  cursor: pointer;
  margin: 5px;
}

#btnToggle:hover {
  background-color: #333; 
}

@media only screen and (max-width: 768px) {
  .header {
    font-size: 30px;
    padding: 20px;
  }

  .overlay a {
    font-size: 28px;
  }

  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 30px;
  }

  .button-menu {
    font-size: 24px;
    padding: 15px;
    width: 150px;
  }

  .container img {
    height: 300px;
    width: 300px;
  }

  .leftcolumn, .rightcolumn {
    width: 100%;
    padding: 0;
  }

  .footer {
    font-size: 16px;
    padding: 15px;
  }
}