body {
    background-color: var(--backgroundDark);
    margin: 0;
}

.dev-bg {
    background-image: url('../asset/dev-bg.jpg');
    background-position: center center;
    background-size: cover;
    width: 100%;
    height: 528px;

    position: relative;
}

.dev-bg-cover {
    background-color: var(--backgroundDark);
    width: 100%;
    height: 529px;
    opacity: 0.9;

    position: absolute;
}

.dev-title-group {
    width: 560px;
    height: 125px;
    padding-top: 120px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

.dev-title {
    color: var(--textDark);
    font-size: 36px;
}

.dev-description {
    color: var(--textDark);
    font-size: 36px;
    padding-top: 18px;
}

img.dev-toolkit {
    width: 140px;
    height: 140px;

    margin-top: 102px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

.hear-bg {
    width: 100%;
    height: 171px;
}

.hear-title {
    color: var(--textDark);
    font-size: 47px;
    text-align: center;

    padding-top: 90px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

.hear-btn-group {
    width: 198px;
    height: 46px;

    padding-top: 30px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

img.hear-btn {
    float: left;
    width: 46px;
    height: 46px;
}

img.facebook {
    margin-left: 30px;
}

img.email {
    margin-left: 30px;
}

.copyright-text {
    color: #FFFFFF;
    font-size: 14px;
    font-style: 300;
    text-align: center;
    padding-top: 10px;
}