.c-optional-course {
    margin-top: 50px;
}
.c-optional-course__title {
    font-size: 36px;
    font-weight: bold;
    color: #66CCFF;
    font-family: 'Square721 Ex BT';
    text-align: center;
    opacity: 0.35;
}
.c-optional-course__subtitle {
    font-size: 36px;
    text-align: center;
    font-weight: bold;
    color: #66CCFF;
    margin-top: 10px;
}
.c-optional-course__desc {
    font-size: 20px;
    font-weight: bold;
    text-align: center;
    margin-top: 20px;
}
.c-optional-course__best_seven {
    width: 1000px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    border-radius: 20px 0 20px 0;
    -moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    -webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    position: relative;
    margin-top: 80px;
}
.c-optional-course__best_seven_balloon {
    position: absolute;
    left: 40px;
    top: -120px;
}
.c-optional-course__options {
    display: flex;
    margin-left: auto;
    margin-right: auto;
    justify-content: center;
    margin-top: 50px;
    > img {
        width: 320px;
        height: auto;
    }
    >img:not(:last-child){
        margin-right: 20px;
    }
}
.c-optional-course__courses_title {
    font-size: 22px;
    color: #66CCFF;
    font-weight: bold;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    margin-top: 50px;
}
.c-optional-course__items {
    display: flex;
    justify-content: left;
    flex-wrap: wrap;
    width: 1000px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 20px;
}
.c-optional-course__course_item {
    width: 320px;
    > div {
        padding:0 15px;
    }
}
.c-optional-course__price {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    width: 1000px;
    height: auto;
    margin-top: 60px;
}