style.css

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Lato', Helvetica, sans-serif;
    background-color: #162955;
    color: #fff;
}

.wrapper {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    max-width: 900px;
    margin: 0 auto;
    padding: 6%;
    width: 100%;
    height: 100%;
}

header {
    display: flex;
    justify-content: center;
    text-align: center;
    margin-bottom: 2em;
}


.box {
    background-color: #061539;
    color: #fff;
    display: flex;
    padding: 2em;
    margin-bottom: 2em;
    border-radius: 5px;
    overflow: auto;
}

.datainput {
    justify-content: center;
    text-align: center;
}

.inputbox input {
    margin-top: 1em;
    font-size: 20px;
    padding: 10px 15px;
    margin-bottom: 1em;
    border-radius: 5px;
    border: none;
}

.inputbox button {
    padding: 10px 15px;
    border-radius: 5px;
    font-size: 20px;
    background-color: #7887AB;
    color: #fff;
    border: none;
    cursor: pointer;
}

.dataoutput {
    padding-top: 2em;   
}


footer {
    text-align: center;
}

footer a {
    color: #fff;
}