* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}
body {
    background-color: rgb(0, 0, 0);
    color: #fff;
}

.app {
    position: relative;
    padding: 10px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    max-width: 500px;
    height: 100vh;
    margin: 0 auto;
}
.app__title {
    text-align: center;
    color: #ffffff;
    font-size: 24px;
    line-height: 24px;
    font-weight: 700;
}
.app__descr {
    text-align: center;
    margin-top: 10px;
    color: rgba(255, 255, 255, 0.75);
    font-weight: 300;
    font-size: 16px;
    line-height: 18px;
}
.app__wrapper {
    padding: 10px 10px;
    width: 100%;
    display: flex;
    flex-direction: column;
    margin-bottom: 30px;
}
.app__subtitle {
    margin-top: 20px;   
    color: rgba(255, 255, 255, 0.75);
    text-align: center;
    font-size: 18px;
    font-weight: 300;
}

.input {
    background-color: rgb(0, 0, 0);
    color: #00e600;
    text-align: center;
    text-transform: uppercase;
    font-weight: 700;
    width: 100%;
    padding-bottom: 5px;
    font-size: 20px;
    border: none;
    border-bottom: 1px solid #00e60040;;
}

input:focus {
    outline: none;
}
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.label {
    position: absolute;
    bottom: 10px;
    opacity: 0.7;
    color: #00e600;
    text-decoration: none;
    font-weight: 300;
    font-size: 12px;
    transition: 0.4s all;
}
.label:hover {
    opacity: 1;
}

@media (min-width: 426px) {
    body .input{
        font-size: 24px;
    }
}