h1, h2, h3, p, ul, li {
    margin: 0;
    padding: 0;
}
li {
    list-style: none;
}

.top {
    background-image: url("../images/top.jpg");
    background-size: cover;
    background-position: center;
    height: 650px;
    text-align: center;
    overflow: hidden;
}
.top-ttl {
    color: #ffffff;
    font-family: serif;
}
.main-ttl {
    font-size: 100px;
    color: #ffffff;
    padding-top: 170px;  
    padding-bottom: 10px;  
}
.border {
    border-top: 7px solid #fe914c;
    width: 50%;
    margin: 0 auto;
    margin-top: 30px;
    margin-bottom: 30px;
}
.top-txt {
    font-size: 20px;
    letter-spacing: 5px;
    color: #ffffff;
}

.issue {
    background-color: #8acfa6;
    padding: 10px 0;
    text-align: center;
}
.issue p {
    color: #ffffff;
    letter-spacing: 5px;
    padding-bottom: 10px;
}
.issue li {
    padding-bottom: 10px;
}

.solution {
    padding-top: 15px;
    background-color: #a7e8cf;
    padding: 20px 20px 20px 20px;
    background-image: url("../images/design1.png");
    background-repeat: no-repeat;
    background-position: top;
}
.ttl {
    background-color: #ffffff;
    text-align: center;
    width: 300px;
    margin: 0 auto;
    padding: 5px 0;
    font-size: 20px;
    color: #058037;
}
.fas {
    font-size: 5vw;
    color: #058037;
    padding-right: 10px;
}
.sol-txt {
    font-size: 20px;
    width: 70%;
    text-align: left;
    margin: 0 auto;
    padding-top: 20px;
    margin-bottom: 20px;
}
.sol-row1 {
    margin-bottom: 10px;
}
.box {
    display: flex;
    flex: 1;
    margin-bottom: 20px;
}

.box-ttl {
    letter-spacing: 3px;
}

.img1, .img2, .row-txt {
    width: 100%;
}
.row-txt {
    background-color: #058037;
    color: #ffffff;
    font-size: 3vw;
    padding: 10% 30px;
    text-align: left;
}
.about {
    background-color: #058037;
}
.about img {
    vertical-align: top;
}

.last {
    background-color: #a7e8cf;
    padding-top: 30px;
    padding-bottom: 20px;
    background-image: url("../images/design2.png");
    background-repeat: no-repeat;
    background-position: top;
}
.last-ttl {
    font-size: 40px;
    font-weight: bold;
    padding-top: 30px;
    padding-bottom: 30px;
    text-align: center;
}
.last-items {
    padding-left: 0;
}
.last-item {
    background-color: #ffffff;
    font-weight: bold;
    font-size: 20px;
    margin: 0 auto;
    margin-top: 10px;
    text-align: left;
    width: 300px;
    padding: 5px 10px;
}
.last-txt {
    text-align: right;
    padding-top: 10px;
    padding-right: 50px;
}
.num1 {
    padding-left: 300px;
}
.num2 {
    padding-left: 240px;
}
.num3 {
    padding-left: 200px;
}
  
@media screen and (min-width: 767px) {
    .sol-row1, .sol-row2 {
        display: flex;
    }
    .row1{
        display: flex;
        align-items: flex-start;
    }
    .row2 {
        display: flex;
        align-items: flex-start;
        flex-flow: row-reverse;
    }
    .txt1 {
        padding: 8% 30px;
        height: 89px;
    }
    .img1, .img2, .row-txt {
        width: 50%;
    }
    .last-item {
        width: 600px;
    }
}

@media screen and (max-width: 768px) {
    .top {
        height: 500px;
    }
    .main-ttl {
        font-size: 70px;
        padding-top: 100px;
    }
    .top-ttl {
        font-size: 20px;
    }
    .border {
        width: 70%;
    }
    .top-txt {
        font-size: 11px;
    }
    .issue li {
        font-size: 12px;
    }
    .sol-txt {
        width: 100%;
        font-size: 16px;
    }
    .row-txt {
        padding: 30px;
        font-size: 25px;
        box-sizing: border-box;
    }
    .last-ttl {
        font-size: 30px;
        padding-bottom: 20px;
    }
    .last-item {
        font-size: 16px;
    }
    .num1 {
        padding-left: 90px;
    }
    .num2 {
        padding-left: 40px;
    }
    .num3 {
        padding-left: 0;
    }
}