style.css

*{
    margin: 0;
    padding: 0;
   box-sizing: border-box;
}
html,body{
    height: 100%;
    width: 100%;
}
#main{
    height: 140px;
    width: 200px;
    background-color: rgba(0, 0, 0, 0);
    border-radius: 5px;
    border-bottom-right-radius: 90px;
    border-bottom-left-radius: 90px;
    border: 4px solid rgba(0, 0, 0, 0.452);
    box-shadow: 1px 10px 10px rgba(0, 0, 0, 0.13);
}
#top{
  border-bottom:4px solid rgba(0, 0, 0, 0.16);
  font-size: 16px;
  color: rgb(71, 71, 255);
  font-style: bold;
  font-family: Oswald;
  text-align: center;
  text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.452);
}
#mid{
    font-size: 13px;
    color: rgb(0, 0, 0);
    font-family: Oswald;
    display: flex;
    justify-content: center;
    align-items: center;
    text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.452);

}
button{
    padding: 2px 5px;
    font-weight: 700;
    border: 2px solid rgba(0, 0, 0, 0.541);
    border-radius: 7em;
    font-size: 20px;
    margin-left: 80px;
    margin-top: 10px;
}
button:hover{
    background-color: rgba(141, 255, 130, 0.58);
}