.row {
    margin: 0 -20px;
}
.one-half,
.one-third,
.two-third,
.one-fourth {
    float: left;
    min-height: 1px;
    padding: 0 20px;
}
.one-half {
    width: 50%
}
.one-third {
    width: 33.33%
}
.two-third {
    width: 66.66%
}
.one-fourth {
    width: 25%
}
/*reszponzívak*/

@media only screen and (min-width: 961px) and (max-width: 1920px) {
    body {
        width: 100%;
    }
}
@media only screen and (max-width: 960px) {
    .center-box {
        width: auto 100%;
    }
    img {
        overflow: hidden;
    }
}
@media only screen and (max-width: 768px) {
    .one-half,
    .one-third,
    .two-third,
    .one-fourth {
        float: none;
        width: 100%;
    }
    .one-fourth {
        margin: 0 0 30px 0;
    }
    footer {
        background-size: auto 100%;
    }
    h1 {
        font-size: 36px;
    }
    h2 {
        font-size: 32px;
    }
    #cover p {
        font-size: 20px;
        width: 100%;
    }
    #cover {
        display: block;
        min-height: auto;
        padding: 30px 0 100px 0;
        background-position: top left;
    }
    #testimonial {
        padding: 100px 0 200px 0;
        background-size: auto 230px;
        background-position: bottom center;
    }
}