.flex_row{display : flex;}
.flex_row_responsive{display : flex; flex-direction: row;}

.gap20{gap : 20px;}
.gap30{gap : 30px;}
.gap40{gap : 40px;}
.gap50{gap : 50px;}
.gap60{gap : 60px;}
.gap70{gap : 70px;}
.gap100{gap : 100px;}

.marginb20{margin-bottom : 20px;}
.marginb30{margin-bottom : 30px;}
.marginb40{margin-bottom : 40px;}
.marginb50{margin-bottom : 50px;}
.marginb60{margin-bottom : 50px;}
.marginb70{margin-bottom : 70px;}


.bg_black{background-color: black; color : #fff;}
.bg_white{background-color: #fff; color : black;}


/* subpage slider */
#slide4.subpage{background-color: #fff; margin : 100px 0;}



@media screen and (max-width: 1000px)  {
    .flex_row_responsive{flex-direction: column;}
}