body{
    height: 100vh;
    background-color: steelblue;
    /*background-image: linear-gradient(to bottom right, steelblue, cadetblue);*/
    background-image: linear-gradient(to bottom right, #034c59, rgb(255, 217, 0));
}
fieldset{
    border: none;
    border-radius: 10px;
    background-color:aliceblue; 
    padding: 25px;
    margin: 0px;
}
h3{
    font-weight: bold;
    margin:-10px 0px;
}

.join_button{
    height: 40px; 
    font-weight: bold;
}