*{
    margin: 0;
    padding: 0;
}

.header{
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(4,9,30,0.7), rgba(4,9,30,0.7)),url(https://media.istockphoto.com/photos/business-people-joining-gears-picture-id1254347556);
    /* background-image: linear-gradient(rgba(4,9,30,0.7), rgba(4,9,30,0.7)),url(https://media.istockphoto.com/photos/pieces-on-chess-board-for-playing-game-and-strategy-picture-id1273331529); */
    /* background-image: linear-gradient(rgba(4,9,30,0.7), rgba(4,9,30,0.7)),url(images/freenaturestock-1740.jpeg); https://media.istockphoto.com/photos/pieces-on-chess-board-for-playing-game-and-strategy-picture-id1273331529 */
    background-position: center;
    background-size: cover;
    position: relative;
}

nav{
    display: flex;
    padding: 2% 6%;
    justify-content: space-between;
    align-items: center;
}

nav img{
    width: 100px;
}

.nav-links{
    flex: 1;
    text-align: right;
}

.nav-links ul li{
    list-style: none;
    display: inline-block;
    padding: 8px 12px;
    position: relative;
}

.nav-links ul li a{
    color: #fff;
    text-decoration: none;
    font-size: 30px;

}

.nav-links ul li::after{
    content:'';
    width: 0%;
    height: 2px;
    background: #f44336;
    display: block;
    margin: auto;
    transition: 0.5s;
    
}

.nav-links ul li:hover::after{
    width: 100%;    
}

.text-box{
    width:90%;
    color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}


.text-box h1{
    font-size:62px;
}

.text-box p{
    margin: 10px 0 40px;
    font-size: 35px;
    color: #fff;
}

.hero-btn{
    display: inline-block;
    text-decoration: none;
    color: #fff;
    border: 1px solid #fff;
    padding: 12px 34px;
    font-size: 13px;
    background: transparent;
    position: relative;
    cursor: pointer;
    
}

.hero-btn:hover{
    border: 1px solid #f44336;
    background: #f44336;
    transition: 1s;
}

nav .material-symbols-outlined {
      display:none;
  }


@media(max-width: 700px){
    .text-box h1{
        font-size: 20px;
    }
    .nav-links ul li{
        display:block;
    }
    .nav-links{
        position: absolute;
        background: #f44336;
        height: 100vh;
        width: 200px;
        top:0;
        right:-200px;
        text-align: left;
        z-index: 2;
        transition: 1s;
    }

     
    nav .material-symbols-outlined {
        display: block;
        color: #fff;
        margin: 10px;
        font-size: 22px;
        cursor: pointer;
      font-variation-settings:
      'FILL' 0,
      'wght' 400,
      'GRAD' 0,
      'opsz' 48
    }

    .nav-links ul{
        padding: 30px;
    }

      
}

/* course */

.course{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

h1{
    font-size: 36px;
    font-weight: 600px;
}

p{
    color: #777;
    font-size: 14px;
    font-weight: 300;
    line-height: 22px;
    padding: 10px
}