.expense-tracker {
    text-align: center;
    margin: 20px auto;
    max-width: 400px;
}

.milk-bottle {
    width: 120px;
    height: 280px;
    background: #ddd;
    border-radius: 50px 50px 30px 30px;
    position: relative;
    overflow: hidden;
    border: 4px solid #000;
    margin: 0 auto;
}

.milk-fill {
    width: 100%;
    height: 0;
    background: linear-gradient(to top, #fff, #ccc);
    position: absolute;
    bottom: 0;
    transition: height 0.5s ease-in-out;
}

#expense-list {
    list-style: none;
    padding: 0;
    margin-top: 10px;
}

#expense-list li {
    font-size: 16px;
    margin: 5px 0;
    font-weight: bold;
}
.milk-bottle {
    position: relative;
    width: 120px;
    height: 250px;
    margin: 0 auto;
}

.milk-svg {
    position: absolute;
    width: 100%;
    height: 100%;
}

.milk-fill {
    transition: height 0.5s ease-in-out;
}