*{
    margin: 0;
    padding: 0;
  }
  
  body {
      font-family: Arial, Helvetica, sans-serif;
      min-height: 100vh;
      background-image: url(./images/19.png); 
      background-repeat: repeat-y;
      background-position: center;
      background-attachment: fixed;
      background-size: cover;
      }
  
  #logo_image{
    width: 300px; /*set the width or max-width*/
    height: auto; /*this makes sure to maintain the aspect ratio*/
    cursor: pointer;
    margin-left: auto;
  }
  
  /*top menu*/
    .topnav {
      background-color: white;
      background-image: none;
      position: fixed;
      top: 0; 
      width: 100%;
      z-index: 1; /*sets the vertical stacking order of a positioned element along the z-axis*/
      display: flex;
      align-items: center;
      flex-wrap: nowrap;
    }
  
    .topnav a {
      color: black;
      text-align: center;
      padding: 41px 43px;
      text-decoration: none;
      font-size: 17px;
      
      white-space: nowrap;
    }
  
    .topnav a:hover {
      background-color: rgba(62, 180, 137, 0.877); 
      color: black;
    }
  
  div.menu-bar li:hover > ul {
    display: block;
  }
  
  /*side menu*/
  .sidebar {
     height: 100%;
     width: 0;
     position: fixed;
     z-index: 1;
     top: 0;
     left: 0;
     background-color: #111;
     overflow-x: hidden;
     transition: 0.5s;
     padding-top: 60px;
    }

  /*inside sidebar*/
  .sidebar a {
     padding: 8px 8px 8px 32px;
     text-decoration: none;
     font-size: 25px;
     color: #818181;
     display: block;
     transition: 0.3s;
    }
        
  .sidebar a:hover {
     color: rgba(62, 180, 137, 0.877);
    }
        
  .sidebar .closebtn {
     background: transparent;
     border: none;
     color: #fff;
     outline: none;
     position: absolute;
     top: 0;
     right: 25px;
     font-size: 36px;
     margin-left: 50px;
     cursor: pointer;
    }
        
  .closebtn:hover{
     color: #4CAF50;
  }
        
  .openbtn {
     font-size: 20px;
     cursor: pointer;
     background-color: white;
     color: black;
     padding: 37.5px 35.5px; /*size of sidebar button(height and lenght)*/
     border: none;
     flex-shrink: 0;
    }
  
  .openbtn:hover {
     background-color: rgba(62, 180, 137, 0.877);
    }
  
  .text {
    padding-top: 10%;
  }
  iframe{
    margin-bottom: 60px;
    width: 80%;
    height: 500px;
  }
  
  #footer {
    position: fixed;
    bottom: 0px;
    background: #333;
    color: #ffffff;
    width: 100%;
    height: 23px;
    text-align: center;
  }

/* Central Frame of Information */
.courses-container {
  padding-top: 140px; /* To be located on top of the fixed menu */
  padding-bottom: 60px;
  max-width: 1000px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* General Title of Page */
.page-title {
  color: #1a252c;
  text-align: center;
  font-size: 38px;
  margin-bottom: 30px;
  font-weight: bold;
}

/* Cards of content */
.course-card {
  background-color: rgba(255, 255, 255, 0.92);
  padding: 35px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(5px);
  margin-bottom: 30px;
}

/* Section's subtitles */
.course-card h2 {
  color: #bd5555;
  font-size: 26px;
  margin-bottom: 15px;
  padding-top: 0;
  text-align: left;
}

/* Paragraphs */
.course-card p {
  color: #2c3e50;
  font-size: 18px;
  line-height: 1.6;
  padding: 0;
  margin-bottom: 15px;
}

/* Lists */
.course-card ul {
  padding-left: 30px;
  margin-bottom: 20px;
}

.course-card li {
  color: #2c3e50;
  font-size: 17px;
  line-height: 1.6;
  margin-bottom: 8px;
}

/* Highlighted Quote */
.highlight-box {
  background-color: rgba(62, 180, 137, 0.15);
  border-left: 4px solid #3eb489;
  padding: 15px 20px;
  border-radius: 0 8px 8px 0;
  font-weight: bold;
  color: #1a252c;
  margin-top: 20px;
}

/* Mobile Responsive */
@media (max-width: 1000px) {
  .courses-container {
    padding-top: 110px;
  }
  .page-title {
    font-size: 30px;
  }
  .course-card {
    padding: 20px;
  }
  .hideOnMobile{
    display: none;
  }
  .hideOnPC {
    display: block;
  }
  .topnav {
    justify-content: space-between;
  }
  #logo_image {
    margin-left: auto;
  }
}