*{
    margin: 0;
    padding: 0;
}
main{
    width: 80%;
    margin: 30px auto;
    padding: 5px;
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    flex-direction: column;
}
main,div#yearAndMonth,div#week > div,.calendarDay{
    border:1px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 0 2px #cc2;
}
div#yearAndMonth{
    width: 100%;
    height: 50px;
    background-color: coral;
    font-size: 30px;
    font-weight: bold;
    display: flex;
    justify-content: space-around;
}
div#yearAndMonth > i{
    font-size: 40px;
}
div#yearAndMonth > i:hover{
    cursor: pointer;
}
div#yearAndMonth > i:nth-of-type(1){
    margin-left: 5px;
}
div#yearAndMonth > i:nth-last-of-type(1){
    margin-right: 5px;
}
div#yearAndMonth > div{
    flex-grow: 1;
    padding-top: 10px;
    text-align: center;
    letter-spacing: 0.5em;
}
div#week{
    width: 100%;
    height: 50px;
    font-size: 26px;
}
div#week,div#calendar{
    font-weight: bold;
    display: flex;
    justify-content: space-between;
}
div#week > div{
    padding: 10px;
    text-align: center;
    flex-grow: 1;
    flex-shrink: 1;
}
div#calendar{
    width: 100%;
    height: 500px;
    font-size: 50px;
    text-align: center;
    flex-wrap: wrap;
}
div#calendar > div.date{
    width:14%;
    height: 100px;
    padding: 20px;
    box-sizing: border-box;
    position: relative;
    flex-grow: 1;
    flex-shrink: 1;
}
.thisDay{
    background-color: rosybrown;
}
.newPlan{
    font-size: 26px;
    cursor: pointer;
    position: absolute;
    top: 10%;
    left: 5%;
}
div.planMassage{
    padding: 20px;
    box-sizing: border-box;
    font-family: "楷体";
    text-align: center;
    background-color: #fff;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
    z-index: 1000;
    display: none;
}
div#biggerToShow{
    width: 100%;
    padding: 30px;
    box-sizing: border-box;
    text-align: center;
    font-size: 30px;
    font-family: "楷体";
    display: none;
}
@media screen and (max-width: 900px) and (min-width: 680px){
    div#calendar{
        font-size: 30px;
    }
    div#calendar > div.date{
        padding: 30px 20px;
    }    
}
@media screen and (max-width: 679px){
    div#yearAndMonth,div#week,div#calendar{
        display: none;
    }
    div#biggerToShow{
        text-align: center;
        display: block;
    }
}