index.css

body {
    background: url("assets/bg/ttten.svg"), #001219;
    background-size: cover;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-weight: bold;
    text-align: center;
    color: #f8f9fa; 
    font-size: 1.75rem;
    margin: 0;
    padding: 0px 0px 40px 0px;
}

button {
    border: none;
    padding: 10px 10px;
    color: #001219;
    font-weight: 700;
    min-width: 75px;
    max-width: 200px;
    font-size: 1.5rem;
    cursor: pointer;
}

button:hover {
    scale: 1.02;
    transition: 250ms ease;
    filter: brightness(90%);
}

button:active {
    transition: 50ms;
    scale: 1.1;
}

.white {
    color: #f8f9fa;
    text-shadow: 0 0 1px #001219;
}

h1 {
    margin-bottom: 10px;
    text-shadow: 0px 0px 2px #001219, 2.5px 3px 1px #ffc300, 2.5px 4px 1px #d3d3d3;
    letter-spacing: 0.2rem;
}

h2 {
    font-size: 5rem;
    padding: 20px 40px;
    background: rgba(248, 249, 250, 0.9);
    color: #001219;
    border: 4px solid #fee440;
    box-shadow: 10px 10px 1px #ffc300;
    min-width: 150px;
    margin: 50px 0px;
}

.app {
    max-width: 368px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: auto;
}

.btn-container {
    display: flex;
    gap: 12px;
}

.description {
    margin: 15px 0px;
}

.increment-btn {
    background: #ffc300;
    font-weight: 800;
}

#save-btn {
    background: #f8f9fa;
    color: #fee440;
    padding: 10px 20px;
    text-shadow: 0px 0px 2px #001219, 1px 7.5px 1px #e0e1dd, 1px -7.5px 1px #e0e1dd;
}

.circuit-wrapper {
    background-color: rgba(0, 18, 25, 0.9);
    color: #f8f9fa;
    width: 350px;
    box-shadow: 10px 10px 1px #e0e1dd;
    border: 10px solid #f8f9fa;
    min-height: 95px;
    padding: 0px 20px;
    margin: 60px 0px 40px 0px;
}

#clear-btn {
    text-shadow: 0px 0px 2px #001219, 1px 7.5px 1px #e0e1dd, 1px -7.5px 1px #e0e1dd;
}