style.css

@import url('https://fonts.googleapis.com/css2?family=Inconsolata:wght@700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

body {
    font-family: "Poppins", sans-serif;
    background-color: #fff;
    color: black;
    margin: 0px;
    padding: 0px;
  }

header {
    font-family: Inconsolata;
font-size: 1.5rem;
font-style: normal;
font-weight: 700;
letter-spacing: -0.08em;
text-align: left; 
}

header h2 {
    margin: 1.25rem 0 0 1.25rem;
}

.container {
    display: flex;
    flex-direction: column;
    max-width: 100%;
}

.scare-image {
    width: auto;
    height: 15rem;
    margin: 3.75rem auto;
}

.page-not-found .first-p{
    font-family: 'Space Mono', monospace;
font-size: 3rem;
font-style: normal;
font-weight: 700;
line-height: 4.438rem;
letter-spacing: -0.035em;
text-align: left;
margin: 3.125rem 0 0.5rem 1.5rem;
}

.second-p {
    font-family: Space Mono;
font-size: 18px;
font-style: normal;
font-weight: 400;
line-height: 1.688rem;
letter-spacing: -0.035em;
text-align: left;
margin: 1.875rem 0 0.5rem 1.5rem;
} 

a {
    display: inline-block;
    background: #000;
    width: 10rem;
    padding: 1rem;
    margin: 3.75rem 0 0 1.5rem;
    color: #fff;
    font-family: Space Mono;
    text-decoration: none;
    font-weight: 400;
    font-size: 14px;
    text-align: center;
}

/*that was mobile first, now the desktop version */

@media (min-width: 600px) {
    .container {
        display: flex;
        flex-direction: row;
        width: 80%;
        margin: auto;
        justify-content: center;
        box-sizing: border-box;
    }

    .scare-image {
        width: 540px;
        height: auto;
        margin: 8rem auto;
    }

    .page-not-found .first-p{
    text-align: left;
    margin: 8rem 0 0.5rem 3rem;
    }

    .second-p {
    margin: 1.875rem 0 0.5rem 3rem;
    } 

    a {
        margin: 3.75rem 0 0 3rem;
    }
}