* {
    margin: 0;
    box-sizing: border-box;
}

h1 {
    display: flex;
    color: midnightblue;
    size: 18px;
    justify-content: center;
    padding: 10px 0;
}

h3 {
    display: flex;
    color: midnightblue;
    justify-content: center;
    padding: 10px;
}

body {
    font-family: sans-serif;
    padding: 90px 20px 0;
}

input {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    padding: 10px;
    width: 100%;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
 }

 select {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    padding: 10px;
    width: 100%;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
 }

 form {
    max-width: 500px;
    margin: 0 auto;
}

.header {
    background-color: white;
    height: 80px;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
}

.nav {
    display: flex;
    justify-content: space-between;
    max-width: 992px;
    margin: 0 auto;
}

.nav-link {
    color: midnightblue;
    text-decoration: none;
}

.logo {
    font-size: 30px;
    font-weight: bold;
    padding: 0 40px;
    line-height: 80px;
}

.nav-menu {
    display: flex;
    margin-right: 40px;
    list-style: none;
}

.nav-menu-item {
    font-size: 18px;
    margin: 0 10px;
    line-height: 80px;
    text-transform: uppercase;
    width: max;
}

.nav-menu-link {
    padding: 8px 12px;
    border-radius: 3px;
}

.nav-menu-link:hover,
.nav-menu-link_active {
    background-color: whitesmoke;
    transition: 0.5s;
}

.nav-toggle {
    color: midnightblue;
    background: grey;
    border: none;
    font-size: 30px;
    padding: 0 20px;
    line-height: 60px;
    cursor: pointer;
    display: none;
}

.my-button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
  }
  
  .my-button:hover {
    background-color: #45a049;
  }
  
  .my-button:active {
    background-color: #3e8e41;
  }

  .form_query_dc3 {
    display: flex;
  }

  .my-button_query {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }

    .header {
        height: 60px;
    }
    
    .logo {
        font-size: 25px;
        padding: 0 20px;
        line-height: 60px;
    }
    
    .nav-menu {
        flex-direction: column;
        align-items: center;
        margin-right: 20px;
        background-color: whitesmoke;
        position: fixed;
        left: 0;
        top: 60px;
        width: 100%;
        padding: 20px 0;
        height: calc(100% - 60px);
        overflow-y: auto;
        left: 100%;
        transition: left 0.3s;
    }
    
    .nav-menu-item {
        line-height: 70px;
    }
    
    .nav-menu-link:hover, 
    .nav-menu-link_active {
        background: none;
        color: #83c5f7;
    }

    .nav-toggle {
        display: block;
    }

    .nav-menu_visible {
        left: 0;
    }
}