@media screen and (max-width: 1400px) {
    header{
        padding: 0 200px;
    }

    main .box div a{
        font-size: 18px;
    }

    .tech{
        padding: 20px 50px;
    }
}

@media screen and (max-width: 1250px) {
    header{
        padding: 0 100px;
    }

    main .box div a{
        font-size: 16px;
    }

    main .box div{
        width: 80%;
    }

    main .box h1{
        font-size: 40px;
    }

    main .box h2{
        font-size: 25px;
    }

    main .box img{
        width: 70%;
    }

    .tech{
        padding: 20px 20px;
    }

    .tech div{
        padding: 0 20px;
    }
}

@media screen and (max-width: 1080px) {
    main .box img{
        width: 80%;
    }
}

@media screen and (max-width: 1000px) {
    header{
        padding: 0 50px;
    }

    main .box div a{
        font-size: 14px;
    }

    main .box div{
        width: 90%;
    }

    main .box h1{
        font-size: 35px;
    }

    main .box h2{
        font-size: 20px;
    }

    main .box img{
        width: 90%;
    }

    .tech{
        padding: 20px 20px;
    }

    .tech div{
        padding: 0 20px;
    }
}

@media screen and (max-width: 900px) {
    main{
        flex-direction: column-reverse;
        height: auto;
        padding: 20px 0px;
    }

    main .box{
        width: 100%;
        height: auto;
        padding: 20px 20px;
    }

    main .box div{
        width: 100%;
        height: auto;
        padding: 20px 0px;
    }

    main .box h1{
        font-size: 30px;
    }

    main .box h2{
        font-size: 18px;
    }

    main .box img{
        width: 30%;
    }

    .tech{
        padding: 20px 20px;
        height: auto;

    }

    .tech div{
        flex-direction: column;
    }

    .tech div img{
        width: 80%;
    }

    .contribute{
        padding: 20px 20px;
        height: auto;
    }

    .contributeBox{
        width: 100%;
    }

}

@media screen and (max-width: 800px) {
    header{
        padding: 0 20px;
    }

    header div{
        height: 50%;
    }

    header nav{
        height: 50%;
    }

    header nav ul{
        height: 100%;
    }

    header nav ul li{
        height: 100%;
    }

    header nav ul li a{
        height: 100%;
    }

}

@media screen and (max-width: 700px) {
    main .box img{
        width: 40%;
    }

    .tech div img{
        width: 100%;
    }
}

@media screen and (max-width: 500px) {
    header div{
        height: 50%;
        width: 40%;

    }
}

@media screen and (max-width: 600px) {
    header div{
        height: 40%;
    }

    header nav{
        height: 50%;
        width: 70%;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }

    header nav ul{
        height: 100%;
        width: 100%;
        display: flex;
        flex-direction: row;
        justify-content: space-around;
    }

    header nav ul li{
        margin-left: 10px;
    }
    header nav ul li .a{
        font-size: 15px;
    }

    header nav ul li .btn{
        font-size: 15px;
        padding: 4px 8px;
    }

    main .box img{
        width: 40%;
    }

    main .box img{
        width: 50%;
    }

    .tech div img{
        width: 100%;
    }

    .contribute{
        height: auto;
    }
    .contributeBox{
        height: auto;
        flex-direction: column;
    }
}

@media screen and (max-width: 450px) {
    header div{
        height: 30%;
        width: 30%;
    }

    header nav{
        height: 50%;
        width: 70%;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }
}