body {
    background-color: aquamarine;
}
body {
    overflow-y: scroll;
}

#mainpage {
    position: absolute;
    font-size: 20px;
    top: 100px;
    left: 50%;
    font-weight: 1000;
    transform: translateX(-50%);
}
.setumei_main{
    position:absolute;
    font-size: 20px;
    top: 150px;
    left:50%;
    transform: translateX(-50%);
}
.fixed-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 90px;            /* バーの高さは自由に調整OK */
    background-color: #7184e2;  /* 好きな色で！例：ダークグレーなど */
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 35px;
    opacity: 0.7; /* 半透明 */
}  
.coingamelink {
    height: 90px;         /* ← 単位を指定！ここが重要 */
    font-size: 20px;
    top: 300px;
    transform: translateX(-50%);
    left: 25%;
    position: absolute;
}
.coingamelink {
    padding: 2px 1px;
    margin: 2px 0;
    color: #fff;
    background: #6eb7ff;
    border-bottom: solid 6px rgba(0, 0, 0, 0.25);
    border-radius: 9px;
    margin: 0; 
    padding: 0;
    height: auto;
}
.mypagelink {
    position: absolute;
    top: 200px;
    font-size: 20px;
    font-weight: bold;
    left: 50%;
    transform: translateX(-50%);
}