#all{
box-sizing:border-box;
margin:10px auto 0 auto;
width:990px;
padding:0;
}

img.space{
margin-bottom:20px;
}

img{
max-width:100%;
}

@media screen and (max-width:760px){

#all{
width:96%;
margin:0 auto;
}


.before_title {
box-sizing: border-box;
width: 100%;
}

.article1 {
width: 100%;
margin: 0;
}

.article2_foreword{
line-height:1.6;
}

#article2_box {
margin: 0;
}

.article3_1 {
margin:0;
}

.article3_3 {
margin: 5px 0 50px;
}


}