:root {
    --right-side: #37c2ed;
    --left-side: #2baee6;
    --background: #195cab;
    --background-top: #144c7f;
}

html,
body {
    height: 100%;
    overflow-x: hidden;
    color: #333;
    background-color: beige;
    overflow-y: hidden;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--background-color);
    font-family: Arial, Helvetica, sans-serif;
    counter-reset: heading;
    perspective: 25rem;
}

main {
    max-width: 768px;
    height: 100%;
}

textarea {
    position: absolute;
    z-index: 2;
    bottom: 300%;
    left: 50%;
    transform: translateX(-50%);
    padding: 15px;
    width: 350px;
}

.message {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.8s 2s;
}

.appear {
    opacity: 1;
}

.send {
    animation: send 0.5s ease-in-out forwards;
}

.mailbox {
    position: relative;
    height: 45px;
    width: 75px;
    background-color: var(--background);
    top: 90%;
    left: 50%;
    transform: translateX(-50%);
}

.mailbox::before {
    content: '';
    height: 50%;
    width: 101%;
    position: absolute;
    bottom: 99%;
    left: -1%;
    background-color: var(--background-top);
    clip-path: polygon(50% 0, 0% 100%, 100% 100%);
    transition: 1s transform 0.7s;
    transform-origin: 50% 100%;
    z-index: 15;
    transform: rotateX(0deg);
}

.close::before {
    transform: rotateX(180deg);
}

.bottom-left {
    position: absolute;
    left: -1%;
    top: -1%;
    height: 102%;
    width: 101%;
    background: var(--left-side);
    clip-path: polygon(0 0, 0% 100%, 100% 100%);
    z-index: 10;
}

.bottom-right {
    position: absolute;
    left: -1%;
    top: -1%;
    height: 102%;
    width: 101%;
    background: var(--right-side);
    clip-path: polygon(100% 0, 0% 100%, 100% 100%);
    z-index: 5;
}

.sendToMailbox {
    animation: sendToMailbox 1.5s ease-in-out forwards 1.5s;
}

button {
    background-color: white;
    border: 1px solid black;
    padding: 7px 25px;
    border-radius: 5px;
    text-transform: uppercase;
    box-shadow: 1px 1px 0 #000000;
}

@keyframes send {
    from {
        transform: translateX(-50%) scale(1);
    }

    to {
        transform: translate(-50%, 95%) scale(0.1, 0.15);
    }
}

@keyframes sendToMailbox {
    from {
        transform: translate(-50%, 0%);
    }

    to {
        transform: translate(-50%, -8000%);
    }
}