html,body{
    width: 100%;
    margin: 0;
    padding: 0;
    font-size: 16px;
}
h1{
    text-align: center;
}
.request {
    z-index: 100;
    position: fixed;
    top:0;
    left: 0;
    width: 100%;
}
.request .menu-bar {
    display: flex;
    flex-direction: row;
}
.request .menu-bar button {
    width:calc( 100% / 7 );
    height: 30px;
    margin: 0;
    padding: 0 5px;
    line-height: 25px;
    font-size: 1.2rem;
    border: none;
    background-color:lightblue;
    text-decoration: underline;
}

@media(max-width : 960px){
    .request .menu-bar button {
        height: 50px;
    }
}

.request .menu-bar button:hover {
    box-sizing: border-box;
    background-color: transparent;
    border: 3px solid lightblue !important;
    line-height: 19px;
}

.request .menu-bar button.a-hover {
    box-sizing: border-box;
    background-color: transparent;
    border: 3px solid lightblue !important;
    line-height: 19px;
}

.down-list {
    visibility:hidden;
}

.down-list button {
    margin: 0 ;
    padding: 0;
    line-height: 30px;

    background-color:darkturquoise;
    border: solid 1px lightblue;
}

#alphabet {
    display: flex;
    flex-wrap: wrap;
    position: absolute;
    top: 30px;
    left: calc( ( 100% / 7 * 2 ) + 3px);
    width: calc( 100% / 7 * 3 );
}

#alphabet button {
    width: calc( ( 100% - 6px ) / 7 );
}

#noun {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 30px;
    left: calc( ( 100% / 7 * 2 ) + 3px);
    width: calc( ( 100% / 7  ) );
}

#noun button {
    width: 100%;
}

#rule-plural-html{
    visibility: hidden;
    height: 0;
}

#absence-of-registration{
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 30px;
    left: calc( ( 100% / 7 * 6 ) + 3px);
    width: calc( ( 100% / 7  ) );
}

#absence-of-registration button {
}

/* 幅が 1280px 以下であれば */
@media (max-width:1280px) {
    #alphabet button {
        width: calc( ( 100% - 6px ) / 6 );
    }
}

/* 幅が 960px 以下であれば */
@media (max-width: 960px) {
    #alphabet {
        top: 50px;
    }
    #alphabet button {
        width: calc( ( 100% - 6px ) / 5 );
    }
}

.container {
    z-index: 10;
    position: absolute;
    top: 25px;
    left: 40px;
    background-color: lightcyan;
    width: calc( 100% - 80px);
    margin: 0 auto;
}
#display div{
    padding: 20px;
    margin-top: 10px;
    background-color:azure;
    border: black 3px solid;
}
h1{
    font-style: italic;
}
table{
    width: 1000px;
    margin: 0 auto;
/*    margin: 10px;*/
    border-collapse: collapse;
}
table.prounce {
    display: inline-block;
}
table.tale-variation {
    display: inline-block;
}
th,td{
    border: solid 1px black;
    padding: 2px 4px;
    text-align: center;
    font-size: 2.0rem;
}

.verbLIst {
    font-size: calc( 2.0vw - 1px );
}


form{
    width: 100%;
}
button{
    margin-left: 0;
}
#text-area{
    display: none;
    width: 100%;
    margin: 5px 0 0 0;
    position: relative;
}
#text-area button {
    position: absolute;
    right: 0;
    top: 52px;
}
#text-area textarea {
    width: 100%;
    height: 4em;
}

#set{
    z-index: 0;
}
.word-sentense {
    position: relative;
    display: inline-block;
    padding-right: 5px;
    font-size: 1.2rem;
    text-decoration: none;
    margin-left: 5px;
    border: solid 0 black !important;
}
.word-sentense a {
    text-decoration: none;
    color: black;
}
.word-sentense span.remark {
    display: none;
}
.word-sentense a:hover span.remark {
    border: 1px solid black;
    background-color: white;
    color: black;
    display: block;
    line-height: 1.2em;
    margin: 0.5em;
    padding: 0.5em;
    position: absolute;
    top: 50px;
    width: 12em;
    z-index: 100;
    font-size: 2.0rem;
}
.toward-top{
    position: fixed;
    bottom: 60px;
    right: 0;
    height: 80px;
    width: 80px;
    background-color: blue;
    border-radius: 10px;
    text-align: center;
    box-sizing: border-box;
    padding: 10px
}
.toward-top a{
  z-index: 999;
    display: inline-block;
    height: 60px;
    width: 60px;
    font-size: 20px;
    text-align: center;
    color: white;
    text-decoration: none;
}

.toward-top a:hover {
  text-decoration: none;
  opacity: 0.7;
}