* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
#app {
    width: 100%;
    max-width: 600px;
    display: flex;
    height: 100vh;
    flex-direction: column;
    margin: 0 auto;
    position: relative;
}
body {
    background-color: #555;
    height: 100vh;
    background-color:#d3f7ff ;
}
.game {
    width: 100%;
    display: flex;
    justify-content: center;
    position: absolute;
    top: 0;
}
.control {
    background-color: #d3f7ff;
    display: flex;
    position: absolute;
    bottom: 0;
    height: 150px;
    left: 0;
    right: 0;
    justify-content: center;
}
.btn-control {
    width: 120px;
    height: 120px;
    font-size: 1.5rem;
    border-radius: 50%;
    background-color: #40407a;
    border: 1rem solid #2c2c54;
    color: #fff;
    margin-left: 1rem;
    cursor: pointer;
}
.btn-control:active {
    background-color: #706fd3;
    border: 1rem solid #474787;
}