utilities.css

*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;

    /* theme  */
    --background-dark-primary: #0f044c;
    --background-dark-shadow: #141e61;
    --text-color-primary: #eeeeee;
    --text-color-shadow: #787A91;

    /* colors  */
    --color-success: rgb(17, 255, 17);
    --color-danger: rgb(255, 17, 17);
    --color-info: rgb(17, 17, 255);
    --color-offline: rgb(151, 151, 151);
    --color-warning: rgb(255, 172, 17);
}

body{
    height: 100vh;
    font-family: monospace;
    font-size: 1.3em;
    background-color: var(--background-dark-primary);
    color: var(--text-color-primary);
}

a{
    text-decoration: none;
    color: var(--text-color-primary);
}
a:hover{
    color: var(--text-color-shadow);
}

.container{
    margin: 0 5em;
}

img{
    max-width: 100%;
}

/* each component  */
section{
    display: flex;
    justify-content: center;
    align-items: center;
}
section > *{
    margin: 2vw;
}

@media screen and (max-width: 780px){
    .container{
        margin: 0 10px;
    }
}