*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.main{
    font-family: "Ubuntu", sans-serif;
    font-size: 1.2rem;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(to right, #b5edef, #05e8a0);
    overflow: hidden;
    padding: relative;
}

nav {
    display: flex;
    width: 80%;
    margin: 20px auto;
    align-items: center;
    font-weight: 550;
    position: sticky;
    z-index: 1;
}

.nav-links {
    flex: 1;
    text-align: right;
}

.nav-links li {
    list-style: none;
}

.logo-area {
    display: flex;
    align-items: center;
}

.logo {
    width: 20%;
    height: 20%;
    margin-right: 12px;
}

.nav-links ul li {
    display: inline-block;
    padding: 0 2rem;
}

.nav-links ul a {
    font-size: 600;
    color: #fff;
    text-decoration: none;
    transition: 0.3s;
}

.nav-links ul a:hover {
    color: #eadfa1;
}

.information {
    width: 550px;
    height: 550px;
    position: absolute;
    top: 50%;
    left: -5%;
    transform: translateY(-50%);
}

#circle {
    width: 550px;
    height: 550px;
    /* background: #ebe6e6; */
    position: absolute;
    border-radius: 50%;
    top: 0px;
    left: 0px;
    transform: rotate(0deg);
    transition: 1s;
}

.feature {
    display: flex;
    position: absolute;
    color: white;
    font-size: 0.8rem;
}

.feature img {
    width: 30%;
}

.feature div {
    margin-left: 20px;
}

.feature div a {
    margin-top: 8px;
}

.one {
    top: 250px;
    right: 0px;
}
.two {
    top: -120px;
    right: 10px;
    transform: rotate(-90deg);
}

.two img {
    width: 8%;
}

.three {
    bottom: 250px;
    left: -10px;
    transform: rotate(-180deg);
}

.four {
    bottom: 20px;
    right: 180px;
    transform: rotate(-270deg);
}

.pc {
    width: 200px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 27%;
    z-index: 1;
}

.control {
    position: absolute;
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
}

.control img {
    width: 8%;
}

.control h3 {
    color: #fff;
    margin: 20px 0;
}

#upBtn {
    cursor: pointer;
}

#downBtn {
    cursor: pointer;
    transform: rotate(-180deg);
}

.overlay {
    width: 0;
    height: 0;
    border-top: 280px solid #fff;
    border-right: 280px solid transparent;
    border-bottom: 280px solid #fff;
    border-left: 280px solid #fff;
}


/* ﾚｷﾎﾟﾝｼﾌﾞ ｽﾏｰﾄﾌｫﾝ */
@media screen and (max-width: 600px) {

/* ヘッダー */
    /* logo-areaとnav-linksを縦に並べる */
    .header {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    /* logoとmy-headingを右並びに横に並べる */
    .logo-area {
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        font-size: 16px;
        margin-left: -120px;
    }

    /* a要素を横並びにする */
    .nav-links ul {
        display: flex;
        flex-direction: row;
        justify-content: space-around;
        font-size: 10px;
        margin-left: -80px;
    }

    .nav-links ul a li {
        margin-left: -25px;
        margin-top: 15px;
    }

    .nav-links ul a {
        color: black;
    }


/* main */

    .control h3 {
        color: white;
    }

    #upBtn,
    #downBtn {
        width: 50px;
        color: white;
    }

    .pc {
        width: 100px;
        margin-left: -80px;
    }

    .information {
        width: 375px;
        position: absolute;
        top: 50%;
        left: -5%;
        transform: translateY(-50%);
        background: linear-gradient(to right, #b5edef, #05e8a0);
    }

    #circle {
        width: 375px;
        height: 550px;
        margin-left: -100px;
    }

    .control {
        margin-top: -120px;
        margin-right: 120px;
    }

    .control h3 {
        font-size: 15px;
    }

    #upBtn,
    #downBtn {
        width: 20px !important;
        height: auto !important;
    }

    .overlay {
        margin-left: -170px;
        margin-top: -5px;
        border-top: 280px solid #fff;
        border-right: 135px solid transparent;
        border-bottom: 280px solid #fff;
        border-left: 280px solid #fff;
    }

    .main {
        background: linear-gradient(to right, #b5edef, #05e8a0);
    }

    .one {
        top: 260px;
        right: 70px;
        width: 80px !important;
        height: auto !important;
        font-size: 9px;
    }

    .two {
        top: 45px;
        right: 8px;
        transform: rotate(-90deg);
        font-size: 8px;
    }

    .three {
        bottom: 255px;
        left: 10px;
        transform: rotate(-180deg);
        font-size: 8px;
    }

    .four {
        bottom: 130px;
        right: 100px;
        transform: rotate(-270deg);
        font-size: 8px;
    }




}