style.css

:root {
    --primary: crimson;
    --dark: #1f2937;
    --darkdark: #111827;
    --light: #f3f4f6;
}
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
body {
    width: 100%;
    min-height: 100vh;
    background-image: linear-gradient(rgba(0, 0, 0, .1), rgba(0, 0, 0, .9)), url(./background_1.jpg);
    background-size: cover;
}

.container {
    margin-top: 5rem;
    text-align: center;
    width: 100%;
}

.container .time {
    font-size: 7rem;
    color: var(--light);
    font-weight: 400;
}
.container  h1 {
    color: var(--light);
    font-size: 2.5rem;
    font-weight: 500;
}

.container form{
    margin-top: 2rem;
}
.container form label {
    color: #eeeeee;
    font-size: 1.3rem;
}
.container form input {
    background: none;
    outline: none; 
    border: none;

    border-bottom: 2px solid var(--light);
    width: 60%;
    font-size: 1.75rem;
    color: #eee;
    margin-top: 2rem;
}

.container form input:focus {
    background: #ddd;
    color: var(--primary);
    border-radius: 5px;
}
.container form button[type="submit"] {
    opacity: 0;
}

.container p {
    position: absolute;
    bottom: 3rem;
    left: 0;
    right: 0;
    text-align: center;
    color: var(--light);
}