#mainimgArea_top {
    background-image:url(./air_festa.png);
    background-repeat: no-repeat;
    background-attachment: fixed;
     background-position-x: center;
     background-size: 100% ;
     background-color: #F5EA5B;
     width: 100%;
     height: 5000px;
 

}


img[src="./event_info.png"]{
    display: flex;
    list-style: none;
    float: right;
    margin: 0;
    padding-left: 0%;
    width: 35%;


}  
img[src="./exibition_info.png"]{
    display: flex;
    list-style: none;
    margin: 0;
    padding:0;
    width: 35%;
}
img[src="./access_info.png"]{
    display: flex;
    list-style: none;
    float: right;
    margin: 0;
    padding: 0;
    width: 35%;
    
}  
img[src="./trail_boaring.png"]{
    display: flex;
    display: flex;
    list-style: none;
    float: left;
    margin: 0;
    padding: 0;
    width: 35%;
}
.box {
    text-align: center;
    position: relative;
    bottom: 0%;
    }







user agent stylesheet
a:-webkit-any-link {
    color: -webkit-link;
    cursor: pointer;
}


user agent stylesheet


ol, ul {
    list-style: none;
}
user agent stylesheet
ul {
    list-style-type: disc;
}
html {
    line-height: 1;
}
<!--ヘッダー終わり-->


html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    font-size: 100%;

}

user agent stylesheet
img {
    overflow-clip-margin: content-box;
    overflow: clip;
}

#mainimgArea_top {
    background-color: #F5EA5B;

}
html {
    line-height: 1;
}
<!-- メイン終わり -->