html{
    font-size: 62.5%;
}
body{
    font-size:1.6rem; 
    line-height: 2;
    background-color: #D9E5FF;
}
#mainDiv {
    display: flex;
    flex-direction: column;
    align-items: center;
    align-content: space-around;
}
#titlediv {
    width: calc(50vw);
    height: calc(10vw);
    font-family: 'Kosugi Maru', sans-serif;
    font-size: calc(3vw);
    display: flex;
    justify-content: space-around;
    align-items: center;
}
#flagdiv {
    position: relative;
    width: 410px;
    height: 390px;
    font-family: 'Kosugi Maru', sans-serif;
    font-size: calc(3vw);
    overflow: hidden;
}
#flagdiv #flagimage {
    position: absolute;
    width: 410px;
    height: 390px;
    background-image: url(./flagimage/flags.png);
    background-position: top -420px left -30px;
}
#flagdiv #countryname {
    background-color: #D9E5FF;
    position: absolute;
    width: 410px;
    height: 390px;
    top: 272px;
}
#flagdiv #countryname.appear {
    top: 390px;
}

#buttondiv {
    width: calc(50vw);
    height: calc(10vw);
    display: flex;
    justify-content: space-around;
    align-items: center;
}
#buttondiv .btn {
    width: 20%;
    /*color: #FFFFFF;*/
    text-align: center;
    font-family: 'Kosugi Maru', sans-serif;
    font-size: calc(1.6vw);
    /*border-style: solid;*/
    border-radius: 8px;
    padding: 2%;
    background-color: #9fb7d4;
    transition: background-color .5s;
}
#buttondiv .btn:hover {
    opacity: 0.7;
}

#skipdreamDiv {
    position: absolute;
    top: 0;
    left: 5vw;
}