main.container {
    background-color: #f5f5f5;
    line-height: 2;
    padding: 20px 50px 0;
}

.big-textbox {
    width: 90%;
    padding: 50px;
}

.yellow-bg {
    background-color: yellow;
}

h2 {
    margin-bottom: 40px;
}

.sm-textbox {
    background-color: #EEEEEE;
    padding: 30px;
}

.inside-sm-textbox {
    width: 70%;
}

h4,
h2 {
    line-height: 1.5;
}

.box {
    width: 100%;
    height: 250px;
}

.gray-bg {
    background-color: #EEEEEE;
}

.box,
.gray-bg,
.yellow-bg {
    margin-bottom: 20px;
}

.gray-bg,
.yellow-bg {
    height: 520px;
}

.contact {
    background: yellow;
    text-align: center;
    padding: 50px;
    margin-top: 50px;
}

span {
    font-weight: bold;
    letter-spacing: 3px;
}

@media (max-width: 991px) {
        h2 {
            font-size: 20px;
        }
        .gray-bg,
        .yellow-bg {
            height: auto;
        }
}
@media (max-width: 767px) {
        .contact {
            margin-top: 20px;
        }
        .box {
            height: auto;
        }
    }