body#body_history::after {
    content: "";
    background: url(../images/white_wave_@2X.png) 0 0 repeat;
    opacity: 0.5;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    z-index: -1; 
}
#m_slide_top_history {
    display: none;
}
#contact_content {
    width: 100%;
}
#thumb_history {
    color: #000000;
    font-size: 4em;
}
.navbar {
    position: relative;
    min-height: 0px;
    border: 0px;   
    width: 100%;
}
.navbar-nav {
    width: 100%;
    text-align: center;
}

#history_content_01 {
    width: 15%;height: auto;
}
#history_content_02 {
    width: 100%;
    margin: 40px 0 150px 0;
}