* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: black;
    color: white;
    font-family: Arial, sans-serif;
}

#container {
    text-align: center;
    margin-top: 8vh;
}

#button {
    font-size: 130px;
    margin-bottom: 20px;
    animation: pulse 2s infinite;
}

h1 {
    font-size: 36px;
    margin: 10px 0 30px;
}

#counter {
    font-size: 64px;
    margin-bottom: 20px;
}

#bar {
    width: 80%;
    height: 32px;
    border: 2px solid white;
    margin: 0 auto;
}

#fill {
    height: 100%;
    width: 0%;
    background: red;
    transition: width 0.25s linear, background 0.25s linear;
}

@keyframes pulse {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.08); }
    100% { transform: scale(1); }
}