*{margin: 0; padding: 0; box-sizing: border-box;}
body{
    background-color:rgb(40, 42, 43);
}

.wrapper_guide{
    width: 1000px;
    background-color: white;
    margin: 0 auto;
    
}

.container_guide{
    min-height: 600px;
    display: flex;
    flex-wrap: wrap;
}

/* Left side menu */
 /* Left menu */
  .left-menu {
    width: 220px;
    background: #f0f0f0;
    border-right: 1px solid #ccc;
    height: 100vh;
    overflow-y: auto;
    padding: 10px;
  }

  .left-menu a {
    display: block;
    padding: 10px;
    color: #333;
    text-decoration: none;
    border-radius: 5px;
    margin-bottom: 5px;
  }

  .left-menu a:hover {
    background: #ddd;
  }

  /* Right content */
  .right-content {
    flex: 1;
    padding: 20px;
  }

  /* Hide all content divs by default */
  .content-box {
    display: none;
    overflow-y: auto;
  }

  /* Show only active content */
  .content-box.active {
    display: block;
  }
  .co2img1{ height: 75px; border-style: solid; border-width: thin; margin-top: 20px; margin-bottom: 20px;}

@media(max-width:600px){
    .wrapper_guide{ width: 100%;}
    .container_guide{width: 100%; min-height: auto;}
    .content-box{width: 100%;}
    .left-menu{width: 100%;}
    .right-content{width: 100%;}
    .left-menu { height: auto; }
    .content-box {height: auto; }
    .co2img1{width:100%;}

}