.hide-style {
    display: none;
    height: 0;
    width: 0;
}

.centerdiv {
    display: flex;
    justify-content: center;
}

.centertext {
    text-align: center;
}


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

.example-div {
    text-align: center;
    font-family: BIZ UDGothic;
    font-size: 24px;
    text-align: center;
}

.remark-div {
    font-family: BIZ UDGothic;
    font-size: 22px;
}

.ruby-div {
    font-family: BIZ UDGothic;
    font-size: 48px;
    cursor: pointer;
}


.tab-widget .tab-button {
    padding: 7px 15px;
    background-color: #cccccccc;
    border: none;
    cursor: pointer;
    display: inline-block;
    line-height: 20px;
}

.tab-widget .tab-button.active {
    background-color: #f0f0f050;
}

.tab-widget .tab-content .tab-pane {
    display: none;
}

.tab-widget .tab-content .tab-pane.active {
    display: block;
}