html{
    background-color: lavender;
}

main{
    display: flex;
    justify-content: center;
    align-items: center;
    margin: auto;
}

h1{
    color:aliceblue;
}

.btn{
    width: 250px;
    height: 100px;
    margin: 6px 50px;
    background-image: url(../assets/pool2.jpg);
}

.btn:active, .btn:hover{
    background-image: 
    linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
    url(../assets/pool2.jpg);
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: black;
    color: #fff;
    text-align: center;
    padding: 5px;
    border-radius: 6px;
    margin-left: 110px;
  }

.tooltip:hover .tooltiptext {
    visibility: visible;
  }