style.css

/* style.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
   /* background-image: url('images/bg.jpg');
    background-attachment: fixed;
    background-size: cover;*/
    align-items: center;
    text-align: center;
    font-family: "Ubuntu Mono", monospace;
    font-weight: 400;
    font-style: normal;
    color: #FFFFFF;
}

#video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
  }
  
  #content {
    margin-top: 10px;
    text-align: center;
    z-index: 1;
  }

.nav-bar {
    max-height: 30px;
    max-width: 90vw;
    display: flex;
    padding-top: 20px;
    margin: 0 auto;
    align-items: center;
    justify-content: space-between;
}

.message {
    height: 3vh;
    font-size: 18px;
    padding-top: 20px;
}

.nav-bar h1 {
    margin-top: 25px;
    font-size: 45px;
    font-family: "Londrina Sketch", sans-serif;
    font-weight: 400;
    font-style: normal;
}

.nav-bar .button {
    width: 100px;
    height: 30px;
    background-color: #EEEEEE;
    border: 1px solid #EEEEEE;
    border-radius: 6px;
    font-family: "Ubuntu", sans-serif;
    font-size: 16px;
    font-weight: bold;
    align-items: center;
    cursor: pointer;
    color: #000033;
}

.nav-bar .button:hover {
    background-color: #FFD369;
}

.message {
    height: 3vh;
    font-size: 16px;
    padding-top: 20px;
    font-family: "Ubuntu Mono", monospace;
    font-weight: 400;
    font-style: normal;
    margin-top: 18px;
}

.container {
    padding-top: 25px;
}

#board {
    width: 450px;
    height: 450px;
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    grid-template-rows: repeat(9, 1fr);
    gap: 1px;
    margin: 18px auto;
   /* background-color: rgba(0, 0, 15, 0.7);*/
    padding: 10px;
    border-radius: 10px;
}

.tile {
    background-color: #070740;
    background-size: cover;
    background-position: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid #1a237e;
    border-radius: 5px;
}

.tile:hover {
    background-color: #0000AA;
}

.tile-selected {
    border: 2px solid #FFD369;
    box-shadow: 0 0 10px #FFD369;
}

.top-left-corner-tile {
    border-top-left-radius: 6px;
}

.top-right-corner-tile {
    border-top-right-radius: 6px;
}

.bottom-left-corner-tile {
    border-bottom-left-radius: 6px;
}

.bottom-right-corner-tile {
    border-bottom-right-radius: 6px;
}

.start-num {
    cursor: default;
}

.horizontal-line {
   border-bottom: 2px solid #FFFFFF;
}

.vertical-line {
    border-right: 2px solid #FFFFFF;
}

#keypad {
    width: 450px;
    height: 55px;
    padding-top: 10px;
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 10px;
    margin: 0 auto;
    justify-content: center;
    align-items: center;
}

.planet-tile {
    width: 42px;
    height: 42px;
    background-color: transparent;
    background-size: cover;
    background-position: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.planet-tile:hover {
    transform: scale(1.1);
}

#clear {
    height: 40px;
    width: 128px;
    margin-top: 20px;
    border-radius: 8px;
    background-color: #FFD369;
    font-size: 20px;
    font-weight: bold;
    font-family: "Ubuntu", sans-serif;
    cursor: pointer;
    border: none;
    color: #000033;
}

#clear:hover {
    background-color: #fcb612;
}

/* Orbit and Pluto styles */
.orbit-container {
    position: relative;
    width: 100%;
    height: 200px;
    margin-top: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s ease-in-out;
}

.orbit-container.visible {
    opacity: 1;
    visibility: visible;
}

.orbit {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 100px;
    border: 2px solid white;
    border-radius: 50%;
    border-right: none;
    border-left: none;
    z-index: 1;
}

.pluto-container {
    position: absolute;
    top: 10px;
    right: 15%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.pluto {
    width: 42px;
    height: 42px;
    background-image: url('images/dwarf.png');
    background-size: cover;
    background-position: center;
    border-radius: 50%;
}

.pluto-text {
    margin-top: 10px;
    font-size: 12px;
    color: white;
    z-index: 2;
}

@media (max-width: 500px) {
    #board {
        width: 360px;
        height: 360px;
    }
    
    #keypad {
        width: 250px;
        height: 50px;
    }
    
    .planet-tile {
        width: 30px;
        height: 30px;
    }

    .orbit-container {
        height: 150px;
    }

    .orbit {
        height: 80px;
    }

    .pluto {
        width: 30px;
        height: 30px;
    }

    .pluto-text {
        font-size: 10px;
    }

    .nav-bar h1 {
        margin-top: 25px;
        font-size: 35px;
        font-family: "Londrina Sketch", sans-serif;
        font-weight: 400;
        font-style: normal;
    }

    .message {
        height: 3vh;
        font-size: 10px;
        padding-top: 20px;
        font-family: "Ubuntu Mono", monospace;
        font-weight: 400;
        font-style: normal;
        margin-top: 18px;
    }

    #clear {
        height: 30px;
        width: 80px;
        margin-top: 16px;
        border-radius: 8px;
        background-color: #FFD369;
        font-size: 16px;
        font-weight: bold;
        font-family: "Ubuntu", sans-serif;
        cursor: pointer;
        border: none;
        color: #000033;
    }

    .pluto-text {
        margin-top: 10px;
        font-size: 6px;
        color: white;
        z-index: 2;
    }
}


@media (max-width: 2000px) {
    #board{
        width: 326px;
        height: 326px;
    }
    .tile{
        width: 34px;
        height: 34px;
    }  
    .message {
        height: 3vh;
        font-size: 8px;
        padding-top: 45px;
        font-family: "Ubuntu Mono", monospace;
        font-weight: 400;
        font-style: normal;
        margin-top: 18px;
    }

    #keypad {
        width: 250px;
        height: 50px;
    }

    .pluto-text {
        margin-top: 10px;
        font-size: 6px;
        color: white;
        z-index: 2;
    }
}

@media (max-width: 400px) {
    .nav-bar{
        padding-top: 35px;
    }
    .nav-bar .button{
        width: 80px;
        height: 30px;
        font-size: 12px
    }
    .mesage{
        padding-top: 30px;
        font-size: 8px;
    }
    .container{
        padding-top: 20px;
    }
    #keypad {
        width: 250px;
        height: 50px;
    }
    .pluto-text {
        margin-top: 10px;
        font-size: 6px;
        color: white;
        z-index: 2;
    }
}

@media (max-width: 800px) {
    .mesage{
        padding-top: 60px;
    }
    .container{
        padding-top: 30px;
    }
    #keypad {
        width: 250px;
        height: 50px;
    }
    .pluto-text {
        margin-top: 10px;
        font-size: 6px;
        color: white;
        z-index: 2;
    }
}