/* Incorrect */.element {    color: red !important;}
/* Correct */section.element {    color: blue;}

/* Incorrect */* {    margin: 0;    padding: 0;}
/* Correct */body {    margin: 0;    padding: 0;}

/* Incorrect */.container {    width: 1000px;}
/* Correct */.container {    max-width: 100%;    box-sizing: border-box;}
@media (min-width: 768px) {    .container {        width: 720px;    }}

/* Incorrect */.box {    width: 100%;    padding: 20px;}
/* Correct */.box {    box-sizing: border-box;    width: 100%;    padding: 20px;}

/* Incorrect */ul li:nth-child(odd) a {    color: red;}
/* Correct */.odd-link {    color: red;}

/* Incorrect */.box {    display: flex;}
/* Correct */.box {    display: -webkit-box;    display: -ms-flexbox;    display: flex;}

/* Incorrect */.column {    float: left;    width: 50%;}
/* Correct */.column {    display: flex;    width: 50%;}

/* Incorrect */.container:after {    content: "";    display: table;    clear: both;}
/* Correct */.container {    overflow: hidden;}

<!-- Incorrect --><div style="color: blue;">Content</div>
<!-- Correct --><link rel="stylesheet" href="styles.css">

/* Incorrect */.center {    position: absolute;    top: 50%;    left: 50%;    transform: translate(-50%, -50%);}
/* Correct */.center {    display: flex;    justify-content: center;    align-items: center;}

/* Incorrect */@import url("reset.css");@import url("layout.css");
/* Correct *//* In styles.css */@import url("reset.css");@import url("layout.css");

/* Incorrect */.animated-element {    animation: spin 5s infinite;}
/* Correct */.animated-element {    transform: rotate(360deg);    transition: transform 0.5s ease-in-out;}

/* Incorrect */.container {    width: 960px;}
/* Correct */.container {    max-width: 100%;}

/* Incorrect */body {    font-family: 'MyCustomFont', sans-serif;}
/* Correct */body {    font-family: 'MyCustomFont', Arial, sans-serif;}

/* Before Minification */.class {    color: red;    font-size: 16px;}
/* After Minification */.class{color:red;font-size:16px;}