:root{
    --c-red:#ee0000;
    --c-yellow:#ffc000;
    --c-blue:#0168b7;
    --c-black:#000000;
    --c-white:#ffffff;
    --sign-size:200px;
}
body{ padding:20px; }
div, p, div:before, div:after{ padding:0px; margin:0; box-sizing:border-box;}

/* 標識のベース設定 */
.route_sign{
    width:var(--sign-size);
    height:var(--sign-size);
    position:relative;
    overflow:hidden;
}
.sign_base,
.sign_content{
    position:absolute;
    width:100%; height:100%;
    margin:0;
    top:0; bottom:0;
    left:0; right:0;
}

/* 丸い標識 */
.route_sign.radius,
.route_sign.radius .sign_base{
    border-radius:var(--sign-size);
}

/* ひし形の標識 */
.route_sign.hishigata{
    border-radius:0.25em;
    transform:rotate(45deg);
    /* 回転したことによってふちっこがはみ出てしまう */
    margin-top:calc(var(--sign-size) / 4.5);
    margin-bottom:calc(var(--sign-size) / 4.5);
    margin-left:calc(var(--sign-size) / 4.5);
}
.route_sign.hishigata .sign_content{
    transform:rotate(-45deg); /* 0°に戻す */
}

/* 落石注意 */
#lv2 .sign_base{
    width:100%; height:100%;
    background:var(--c-yellow);
}
#lv2 .sign_base:before,
#lv2 .sign_base:after{
    content:"";
    display:block;
    position:absolute;
    margin:auto;
    top:0; bottom:0;
    left:0; right:0;
}
#lv2 .sign_base:before{
    width:95%; height:95%;
    border:var(--c-black) solid 6px;
}

#lv2 .sign_base:after{
    width:calc(95% - 8px); height:calc(95% - 8px);
    background:var(--c-yellow);
    border-radius:8px;
}

#lv2 .sign_content{
    width:calc(var(--sign-size) * 0.7);
    height:calc(var(--sign-size) * 0.7);
    border-bottom:var(--c-black) solid 3px;
}

/* おやま */
#lv2 .sign_content .yama{
    position:absolute;
    top:43px;
    border-bottom:var(--c-black) solid 95px;
    border-left:transparent solid 55px;
    border-right:transparent solid 45px;
}

#lv2 .sign_content .stones{
    position:relative;
    height:100%;
}
#lv2 .sign_content .stones p{
    position:relative;
    width:15px;
    height:16px;
    background:var(--c-black);
    border-radius:20px;
}

#lv2 .sign_content .stones p:nth-child(1){
    border:var(--c-yellow) solid 3px;
    border-top-width:2px;
    border-left-width:5px;
    box-sizing:content-box;
    top:47px; left:41%; transform:rotate(-42deg);
}
#lv2 .sign_content .stones p:nth-child(2){ top:52px; left:61%; transform:rotate(-30deg); }
#lv2 .sign_content .stones p:nth-child(3){ top:65px; left:69%; transform:rotate(-35deg); }
#lv2 .sign_content .stones p:nth-child(4){
    top:71px; left:78%; transform:rotate(-90deg);
    border-radius:0 20px 20px 0;
    width:12px;
}

#lv2 .sign_content .stones p span{
    transform: rotate(-100deg);
}
#lv2 .sign_content .stones p span{
    display:block;
    width:10px; height:2px;
    background:var(--c-black);
    position:relative;
}
#lv2 .sign_content .stones p span:nth-child(1){
    top:-9px;
    right:-4px; 
}
#lv2 .sign_content .stones p span:nth-child(2){
    top:-10px;
    right:0px; 
}
#lv2 .sign_content .stones p span:nth-child(3){
    top:-11px;
    right:4px; 
}

#lv2 .sign_content .stones p:nth-child(3) span{
    transform:rotate(100deg);
}

#lv2 .sign_content .stones p:nth-child(3) span:nth-child(1){
    right:-10px;
    top:-6px;
}
#lv2 .sign_content .stones p:nth-child(3) span:nth-child(2){
    right:-6px;
    top:-9px;
}
#lv2 .sign_content .stones p:nth-child(3) span:nth-child(3){
    right:-2px;
}