html { 
    margin: 0px;
    padding: 0px;
   height: 100%;
    overflow: hidden;
  overscroll-behavior: none;
}
body {
    background-image: url("image/webGL_bg.png") ;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    margin: 0px;
    padding: 0px;
   height: 100%;
    overflow: hidden;
}
.logo {
    position: absolute;
    top: 40px;
    left: 50%;
     transform: translateX(-50%);
    width: 25em;
    height: auto;
}
.signin {
    display: flex;
    justify-content: center;
    align-items: center;
   min-height: 100vh;
}
.buttonParent {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    gap: 0.8em;
    max-width: 30.5em;
    width: 80%;
    height: 12em;
    border-radius: 1em;
    box-sizing: border-box;
    border: solid 1px #FFFFFF;
    margin-top: 17.5em;
    backdrop-filter: blur(12px);
}
button {
    /* ボタンの装飾削除 */
    background: transparent; 
    border: none;
    outline: none;
    box-shadow: none;
    /* 文字、サイズなど */
    max-width: 25em;
    min-width: 8em;
    width: 90%;
    height: 3.3em;
    font-size: 18px;
    font-weight: bold;
    color: #FFF;
    position: relative;
    vertical-align:middle;
    background-image: url("image/secondary-box.png"); 
    background-position: center center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
button:hover
{
    /* マウスオーバーしたら色を調整 */
    filter:brightness(1.2);
}
button img
{
    width: 2em;
    height: 2em;
    padding: 0.6em;
    vertical-align: middle;
    /* 画像も手前に出す */
    position: relative;
    inset: 0;
    z-index: 1;
}
iframe{
    display: block;
    width: 100%;
    height: 100vh;
}
.mainProject{
    margin: 0px;
    padding: 0px;
    height: 100%;
}