/*main*/
#main{ background: url(img/about.png) no-repeat; background-size: cover; background-position: center }

/*about*/
#about{ padding-bottom: 50px; background: url(img/about_01.png) no-repeat; background-size: 20%; background-position: 50% 100% }
#about p{ text-align: center }

@media(max-width: 768px){
/*about*/
#about{ padding-bottom: 40px background: url(img/about_01.png) no-repeat; background-size: 80%; background-position: 50% 85% }
}