.flex-box{display:flex;justify-content:space-between;}
.flex-box .left-box{width:200px;}
.flex-box .right-box{width:calc(100% - 230px);}
.flex-box .left-box .img-box{width:200px;border: 1px solid #cdcdcd;padding: 8px;border-radius: 8px;box-sizing: border-box;background-color: #f3f3f3;}

@media screen and (max-width:640px) {
	.flex-box{display:block;}
	.flex-box .left-box{width:100%; text-align:center; margin-bottom:20px;}
	.flex-box .left-box .img-box {margin:0 auto;}
	.flex-box .right-box{width:100%;}
}