@import
url('https://fonts.googleapis.com/css?family=Muli&display=swap');

body{
    font-family: 'Muli', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    transition: background 0.3s ease;
}

.change-btn{
    background-color: #000;
    border: 0;
    color: #fff;
    cursor: pointer;
    font-family: inherit;
    font-size: 18px;
    padding: 20px 50px;
}

.change-btn:active{
    transform: scale(.98);
}
.color-text{
    font-size: 14px;
}