* {
    margin: 0;
    padding: 0;
}

img {
    max-width: 100%;
    height: auto;
}

.main_title {
    width: 500px;
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 30px;
}

.start_btn {
    text-decoration: none;
    background-color: #e24717;
    display: block;
    width: 300px;
    line-height: 70px;
    margin-left: auto;
    margin-right: auto;
    color: #fff;
    text-align: center;
}

.start_btn:hover {
    opacity: 0.6;
}

.robot_detail {
    width: 500px;
    box-shadow: 0 0 3px #999;
    margin-left: auto;
    margin-right: auto;
    margin-top: 100px;
    margin-bottom: 100px;
    padding: 50px;
}

.robot_detail h1 {
    margin-bottom: 20px;
}

.robot_detail dl {
    margin-bottom: 20px;
}

.robot_detail dl dt {
    width: 100px;
}

.robot_detail dl dd input,
.robot_detail dl dd select {
    border: 1px solid #999;
    padding: 1rem;
}

.robot_detail button {
    border: none;
    background-color: #e24717;
    width: 300px;
    line-height: 70px;
    color: #fff;
    cursor: pointer;
}

.robot_detail button:hover {
    opacity: 0.6;
}

.bg {
    background-image: url(../img/bg.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    height: 100vh;
    width: 100vw;
}

figure {
    position: absolute;
    text-align: center;
}

figcaption {
    padding: 0 1em;
    border: 1px solid #999;
    border-radius: 100px;
    color: #fff;
}

figure span {
    position: absolute;
    top: -30px;
    right: 0;
}

figure a {
    color: #fff;
    text-decoration: none;
}

.back {
    border: none;
    background-color: #e24717;
    width: 70px;
    line-height: 70px;
    border-radius: 35px;
    display: block;
    text-decoration: none;
    text-align: center;
    position: fixed;
    right: 10px;
    bottom: 10px;
    color: #fff;
    cursor: pointer;
}