Style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto&family=Roboto+Mono&display=swap');
:root{
    --bgColor: #333;
    --textPrimary: #fff;
    --textSecondary: #666;
    --primaryColor: #fd4;
}
body{
    font-family: 'Roboto', sans-serif;
    background-color:var(--bgColor);
    color: var(--textPrimary);
    font-size: 1.4rem;
}
nav {
    background-color: #333;
    padding: 10px;
  }
  
  ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
  }
  
  li {
    display: inline-block; 
    margin-right: 20px; 
    }
  
  a {
    text-decoration: none;
    color: white; 
    font-weight: bold;
  }
  
  a:hover {
    color: #ffcc00;
  }
main{
    width: 600px;
    margin: 50px auto;
}
h1{
    color: var(--primaryColor);
}
h1 img{
    width: 40px;
    fill: var(--primaryColor);
}
#header{
    display: grid;
    grid-template-columns: 1fr 1fr;
    margin: 20px 6px 30px;
}
#buttons{
    text-align: right;
}
#info{
    color: var(--primaryColor);
}
button{
    background: rgba(255,255,255,.2);
    border:0;
    color: rgba(255,255,255,.5);
    padding: 5px 20px;
    border-radius: 5px;
    cursor: pointer;
}
div#game{
    line-height:35px;
    height:105px;
    overflow: hidden;
    position: relative;
}
div#game:focus{
    outline:0;
}
#words{
    filter: blur(5px);
    color: var(--textSecondary);
}
#game:focus #words{
    filter: blur(0);
}
#focus-error {
    position: absolute;
    inset: 0;
    text-align: center;
    padding-top: 35px;
}
#game:focus #focus-error{
    display:none;
}
div.word{
    display: inline-block;
    font-family: 'Roboto Mono', monospace;
    margin: 0 5px;
}
.letter.correct{
    color: #fff;
}
.letter.incorrect{
    color: #f55;
}
@keyframes blink{
    0%{
        opacity: 1;
    }
    50%{
        opacity: 0;
    }
    100%{
        opacity: 1;
    }
}
#cursor{
    display:none;
    width: 2px;
    height: 1.6rem;
    background: var(--primaryColor);
    position: fixed;
    top: 198px;
    left: 18px;
    animation: blink .3s infinite;
}
#game:focus #cursor{
    display: block;
}
#game.over #words{
    opacity: .5;
    filter: blur(0px);
}
#game.over:focus #cursor{
    display:none;
}
#game.over #focus-error {
    display: none;
}