* {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 62.5%;
}

body {
    background-color: #607D8B;
    font-family: 'Lato', 'Arial', sans-serif;
    font-size: 2rem;
}

header {
    font-size: 3rem;
    text-align: center;
    padding: 1rem;
}

.container {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
    -ms-flex-flow: row wrap;
    flex-flow: row wrap;
}

.password-box {
    background-color: #607D8B;
    color: #FFC107;
    width: 100%;
    text-align: center;

    letter-spacing: 1rem;
    font-size: 4rem;
    padding: 1rem;
}

.letters-box {
    border-right: 1px solid #05050517;
    background-color: #607D8B;
    width: 50%;
    text-align: center;
    font-size: 3rem;
    
    display: -webkit-box;
    
    display: -ms-flexbox;
    
    display: flex;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
    -ms-flex-flow: row wrap;
    flex-flow: row wrap;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center; 
    -webkit-box-pack: center; 
    -ms-flex-pack: center; 
    justify-content: center;
    min-height: 35rem;
    padding-left: 1rem;
}

.picture-box {
    border-left: 1px solid #05050517;
    background-color: #607D8B;
    width: 50%;
    text-align: center;
}


button {
    background-color: #FFC107;
    color: #ffffff;
    border: none;
    font-size: 2rem;
    padding: 3px;
    cursor: pointer;
    -webkit-transition: -webkit-transform .2s;
    transition: -webkit-transform .2s;
    transition: transform .2s;
    transition: transform .2s, -webkit-transform .2s;
}

button:hover {
    -webkit-transform: scale(1.2);
    transform: scale(1.2);
}

.active {
    cursor: pointer;
    border: 1px solid black;
    border-radius: 10px;
    width: 45px;
    height: 45px;
    margin: 2px;
}

.active:hover {
    color: #FFC107;
    border: 1px solid #FFC107;
    border-radius: 10px;
}

.inactive {
    cursor: default;
    color: white;
    width: 45px;
    height: 45px;
    margin: 2px;
}