.rse_layer1 {width: 100%; background-color:#f3f3f3;}
.rse_layer1_sub {font-size: 18px; font-family: 'poppins';width: 80%;margin: 50px auto 0 auto;line-height: 30px;letter-spacing: 0.05em;font-weight: 500;text-align: center;color: black}
.rse_layer1_title {text-align: center;padding-top: 100px;}
.rse_layer1_title span{font-family: 'Poppins-Bold';text-align: center;width: 100%;
font-style: normal;font-weight: 700;font-size: 44px;line-height: 66px;/* identical to box height */
text-align: center;color: #05507D;}
.rse_layer1_wrap{display: flex;width: 90%;margin: 0 auto;}
.rse_layer1_wrap > div{display: inline-block;margin: 30px auto; width: 50%;}
.rse_layer1_wrap > div p{font-family: 'Real Head Pro';
    font-style: normal;
    font-weight: 400;
    font-size: 16px;
    line-height: 30px;
    letter-spacing: 0.05em;
    color: black}
    .extra {width: 70%;margin: 0 auto;}
    .extra h1 {font-size: 20px; color: black; width: 100%;}
    .extra h1::before{background-size: 50px; background-image: url(img/rse/img_concept_02.png);width: 50px;height: 50px; content: '';
        display: inline-block;margin-right: 15px;}
    .extra p {background-color: #05507D;font-family: 'poppins';border-radius: 15px; width: 100%; padding: 25px;color: white;}
.rse_wlogo{width: 100%; text-align: center;margin: 100px auto;padding-bottom: 100px;}
.rse_fotos_wrap {width: 90%;display: flex;margin: 0 auto;}
.rse_fotos_wrap>div{ margin: 0 auto;display: inline-block; width: 300px;height: fit-content;}
.rse_fotos img{width: 300px; height: 200px;}
 
.box_text { font-family: 'Real Head Pro';font-style: normal;font-weight: 400;font-size: 16px;line-height: 31px;letter-spacing: 0.05em;color: white;}
.box_title {font-family: 'Poppins-bold';font-style: normal;font-weight: 700;font-size: 28px;line-height: 40px;/* identical to box height */


color: #ec9f0f;}
 

.rse_layer1_logoposco {text-align: center; margin-top: 50px;}
.rse_layer1_logoposco img{width: 190px;}
.rse_layer2 {width: 100%;background-color: white; }
.rse_layer2_wrap{width: 90%;margin: 0 auto;}
.rse_bsp{background-size: 100%; margin: 50px auto;text-align: center;}
.rse_bsp img{width:60%;}
.rse_layer2_title {width: 90%;margin: 0 auto; text-align: center;}
.rse_layer2_title h1 {font-size: 36px; font-family: "poppins-bold";color: #05507D;}
.rse_layer2_title p {width: 70%;margin: 0 auto;font-family: "real head pro";letter-spacing: 0.05em;line-height: 26px;color: #4A6375;}
 .rse_layer4 {background-color: #4A6375;padding-bottom: 100px;}
.rse_layer4_title h1{text-align: center;margin: 100px auto;font-family: 'poppins-bold';font-size: 36px;color: #ec9f0f;padding-top: 100px;}
.rse_layer5_title h1{text-align: center;font-family: 'poppins-bold';font-size: 36px;color: #ec9f0f;padding-top: 100px;}
.rse_layer4_title p{text-align: center;margin: 100px auto;font-family: 'poppins-bold';font-size: 36px;color: white;}