style.css

* {
    font-family: "Roboto", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

canvas {
    width: 292px;
    height: 360px;
}

body {
    display: flex;
    width: 608px;
    flex-wrap: wrap;
    padding: 32px;
    background: #2c3139;
    font-size: 15px;
    line-height: 22px;
    margin: 0;
    color: #9ca6b4;
}

textarea {
    flex-grow: 1;
    padding: 12px 15px;
    margin-left: 24px;
    background: #373e48;
    border: 1px solid #252a31;
    outline: none;
    color: #d6dae0;
    font-size: 15px;
    resize: none;
}

textarea:focus {
    border-color: rgba(68, 188, 149, .8);
}

textarea::placeholder {
    color: #707e93;
}

.separator {
    margin: 12px 0 8px;
    font-size: 12px;
    line-height: 20px;
    padding: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

button {
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    padding: 5px 14px;
    letter-spacing: .05em;
    text-transform: uppercase;
    background: #424a56;
    color: #8d98a9;
    border: 2px solid #252a31;
    border-radius: 4px;
}

button:focus {
    box-shadow: 0 0 0 4px rgba(0, 0, 0, .1);
}

button:hover {
    background: #4d5765;
    color: #c7cdd5;
    cursor: pointer;
}

button:disabled {
    background: #4d5765;
    color: #7f8b9e;
    border-color: #252a31;
    opacity: .65;
    box-shadow: none!important;
    cursor: default;
}

a {
    color: #8d98a9;
    /* text-decoration: none; */
    cursor: pointer;
    margin-left: 16px;
}