.link-btn-subpage {
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
.separator-section-btn {
    clear: both;
    width: 100%;
    height: 40px;
}

@media (max-width: 721px) {
    .link-section {
        text-align: center;
        position: relative;
        right: auto;
        bottom: auto;
        width: 100%;
        margin-top:15px;
    }
    .link-btn-subpage {
        display:block !important;
    }
    .separator-section-btn {
        display: none;
    }
    .child-section-header h1 {
        font-size: 24px;
        font-weight: 300;
    }
}