body {
    background-color: #CCFFFF
}

#contentArea {
    margin: 10px 0;
    text-align: center;
}

h1 {
    text-align: center;
    font-size: 40px;
    font-family: Times New Roman;
}

h2 {
    margin: 5px;
}

h3 {
    margin: 10px 0;
}

.aboutCalender {
    font-size: 20px;
    padding: 40px 0;
    font-weight: bold;
}

.tabbox {
    text-align: left;
    width: 1000px;
    margin: auto;
    padding: 0;
}

.tabbox input {
    display: none; 
}

.tab {
    display: inline-block;
    border-width: 1px 1px 0px 1px;
    border-style: solid;
    border-color: black;
    border-radius: 0.75em 0.75em 0px 0px;
    padding: 0.75em 1em;
    color: black;
    background-color: #e0e0e0;
    font-weight: bold;
}

.tab:hover {
    background-color: #ccffcc;
    color: green;
    cursor: pointer;
}

input:checked + .tab {
    color: red;
    background-color: #ffffcc;
    position: relative;
    z-index: 10;
}

.tabContent {
    display: none;
    border: 1px solid black;
    margin-top: -1px;
    padding: 1em;
    position: relative;
    z-index: 0;
    background-color: #ffffcc;
}

#tabcheck1:checked ~ #tabContent1 {
    display: block;
}

#tabcheck2:checked ~ #tabContent2 {
    display: block;
}

#tabcheck3:checked ~ #tabContent3 {
    display: block;
}

.tabContent .content {
    display: flex;
    margin: 10px;
    max-width: 950px;
}

.tabContent .content.center {
    margin: 0;
}

.tabContent .content.caution {
    font-size: 12px;
    font-weight: bold;
}

.tabContent .content .center {
    text-align: center;
}

.tabContent .content img {
    width: 60%;
    min-width: 100px;
}

.tabContent .content .max img {
    width: 100%;
}

.tabContent .content .half img {
    width: 50%;
}

.tabContent .content .right img {
    float: right;
}

.tabContent .content .explainArea {
    width: 100%;
    padding: 0 20px;
}

.tabContent .content .explainArea.main {
    width: 135%;
}

.tabContent .content .explainArea img{
    padding: 10px 0;
}

.tabContent .content.center .explainArea.main {
    text-align: right;
    font-weight: bold;
}