index.css

* {
    box-sizing: border-box;
}    

body {
    margin: 0;
    background: no-repeat center center fixed; 
    background-size: cover;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    text-shadow: 0px 0px 20px #242424;
}

main {
    padding: 15px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

div.top {
    display: flex;
    justify-content: space-between;
}

h1.time {
    text-align: center;
    font-size: 5rem;
}

div#weather {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    align-self: flex-start;
    margin-top: -20px;
}

div#weather > img {
    width: 70px;
}

p.weather-city {
    width: 100%;
    text-align: right;
    margin: 0;
    margin-top: -10px;
    font-size: 1.2rem;
}

p.weather-temp {
    margin: 0;
    font-size: 1.7rem;
    margin-left: -10px;
}

p#author {
    font-size: 1rem;
}

.dog-img {
    width: 300px;
    border-radius: 5px;
    position: absolute;
}