.introduction {
    background: #18181c url(../images/gb.jpg) no-repeat;
    background-size: cover;
}

.introduction .cistern {
    padding-top: 70px;
    padding-bottom: 70px;
}

.introduction p {
    font-size: 20px;
    line-height: 1.7;
    color: #333;
    padding-bottom: 30px;
}

@media(max-width: 750px) {
    .introduction p {
        font-size: 16px;
        padding-bottom: 10px;
    }

    .introduction .cistern {
        padding-top: 40px;
        padding-bottom: 40px;
    }
}