* {
    box-sizing:border-box;
}

body{
    margin:0;
    background:rgb(255, 147, 208);
    height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
}

.box{
    width:150px;
    height:150px;
    position:relative;
}

.button-container{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    width:1120px;
    margin:0 auto;
}

.button{
    font-family: "liebelotte", sans-serif;
    font-weight: 700;
    font-style: normal;
    width: 150px;
    height: 150px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    font-size: 30px;
    background-color:rgb(255, 100, 203);
}

.button:hover{
    transform:scale(1.05);
    cursor:pointer;
}

.picture{
    width: 150px;
    height: 150px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    opacity:0;
    transition: opacity 0.3s;
}

.picture.show{
    opacity:1;
}

.birthday-msg{
    font-family: "liebelotte", sans-serif;
    font-weight: 400;
    font-style: normal;
    position:absolute;
    top:-35px;
    font-size:70px;
}

.music-btn{
    font-family: "liebelotte", sans-serif;
    font-weight: 500;
    font-style: normal;
    font-size:30px;
    position:absolute;
    bottom:10px;
    width:200px;
    height:60px;
}

.music-btn:hover{
    transform:scale(1.05);
    cursor:pointer;
}