.landing {
    background-image: url('../img/landing_background.png');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
}

.left_content {
    width: 70%;
}

.kangpt_logo {
    -webkit-backface-visibility: hidden;

}

.learn_more_characters {
    -webkit-backface-visibility: hidden;

}

.left_content_imgs {
    width: 80%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    height: 100%;
    justify-content: space-evenly;
}

.right_content {
    margin: 40px 0px;
    width: 30%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}



.grade_button {
    color: #333;
    background-color: #6CC9F2;
    font-size: 42px;
    width: 85%;
    text-align: center;
    border-radius: 30px;
    padding: 8px 0;
    box-shadow:
        inset -5px -5px 10px rgba(0, 0, 0, 0.2),
        inset 5px 5px 10px rgba(255, 255, 255, 0.5);
}

.grade_button:not(:first-child) {
    margin-top: 60px;
}

.grade_button_disable {
    background-color: #ccc;
    color: #fff;
}



.sidebar {
    width: 50%;
    padding: 2rem;
}



.content {
    max-width: 100%;
    display: flex;
    height: 100%;
}

.content_btn:hover {
    transition: transform 0.5s;
    transform: scale(1.03);
}

.title_image {
    width: 80%;
}

.image {
    position: relative !important;
}

.sidebar_image {
    width: 100%;
}


/* タブレット */
@media (max-width: 1179px) {
    .content {
        flex-direction: column;
        align-items: center;
    }

    .right_content {
        width: 70%;
        align-items: center;
    }

    .left_content {
        width: 75%;
        margin-top: 30px;
    }
}


@media (max-width: 767px) {
    .grade_button {
        font-size: 24px;
    }

    .grade_button:not(:first-child) {
        margin-top: 40px;
    }
}