@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}
body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #222;
}
.box {    
    position: absolute;
    width: 80px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #333;
    border-radius: 50px;
    box-shadow: 0 5px 50px rgba(0, 0, 0, 0.5);
}
.spinner {
    /* border: 2px solid rgb(69, 214, 86); */
    position: relative;
    width: 40px;
    gap: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    user-select: none;
}
.progress {
    /* border: 2px solid yellow; */
    width: 10px;
    position: relative;
    background: #222;
    height: 300px;
    border-radius: 20px;
    display: flex;
    flex-direction: column-reverse;
}
.progress #meter {
    /* border: 2px solid yellow; */
    position: absolute;
    width: 100%;
    background: #0f0;
    /* min-height: 200px; */
    border-radius: 20px;
    filter: drop-shadow(0 0 2.5px #0f0) drop-shadow(0 0 10px #0f0); 
    transition: 0.5s;
}
.btn {
    /* border: 2px solid red; */
    position: relative;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    background: #444;
    font-size: 1.5em;
    color: #fff;
    border-radius: 50%;
    text-shadow: 0 0 5px #fff,
    0 0 10px #fff;
    cursor: pointer;
    font-weight: 500;
}
.btn:active {
    font-size: 1.25em;
    box-shadow: inset 0 0 15px rgba(0,0,0, 0.9);
}
#output {
    position: relative;
    color: #fff;
    font-size: 2em;
    text-shadow: 0 0 5px #fff;
}