body {
    font-family: 'Roboto', sans-serif;
    padding: 0;
    margin: 0;
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 40px 20px;
    background-color: whitesmoke;
    justify-content: center;
}
header {
    padding: 0 0 30px 0;
    font-size: 30px;
}
.counter {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.counter__header {
    font-size: 2em;
}
.counter__textarea {
    width: 100%;
    height: 400px;
    resize: none;
    padding: 10px;
    border: none;
    border-radius: 10px;
    box-shadow: 0 0 25px rgba(0, 0, 0, .2);
    transition-duration: 400ms;
}
.counter__textarea:focus {
    outline: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .35);
}
.counter__button {
    display: block;
    margin: 20px 0 0 0; 
    padding: 10px 80px;
    font-size: 1em;
    background-color: lightgreen;
    border: none;
    box-shadow: 0 10px 25px rgba(0, 0, 0, .1);
    border-radius: 10px;
    font-weight: bold;
    transition-duration: 400ms;
}
.counter__button:hover {
    transform: scale(0.95);
    background-color: rgb(89, 207, 78);
}
.counter__button:focus {
    outline: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
}
.counter__button:active {
    transition-duration: 100ms;
    transform: scale(0.8);
}