.bt1 {
    position: absolute;
  top: 60%;
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
    background-color: #FFFFFF;
color: #000000;   
    font-family: Michroma, sans-serif;
    border-radius: 8px;
    padding: 8px 8px;
    width: 15%;
    height:8%
    box-shadow: inset -1px -1px 7px 3px rgb(0 0 0 / 25%);
    font-size: 20px;
    font-weight: 700;
    text-align: center;
    white-space: nowrap;
}
.overallbg {
    background-color: black;
    background-image: url('moon.jpg');
    background-size: 100% 100%;
    background-size: contain;
    color: whitesmoke;
    font-family: 'Michroma', sans-serif;
}