* {
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    overflow: hidden;
    color: #EEE;
    background-color: #111;
}

input.h1 {
    font-family: monospace;
    font-weight: bold;
    font-size: 36px;
    padding: 0 15px;
    margin: 15px 0;
    display: block;
    color: #EEE;
    background: transparent;
    border: none;
    width: 100%;
}

#clippy {
    width: 100%;
    height: 100%;
    background-color: #333;
    color: #EEE;
    border: none;
    padding: 15px;
    font-family: monospace;
    font-size: 16px;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
    resize: none;
    border-radius: none;
}

* {
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    overflow: hidden;
    color: #EEE;
    background-color: #111;
}

input.h1 {
    font-family: monospace;
    font-weight: bold;
    font-size: 36px;
    padding: 0 15px;
    margin: 15px 0;
    display: block;
    color: #EEE;
    background: transparent;
    border: none;
    width: 100%;
}

#clippy {
    width: 100%;
    height: 90%;
    background-color: #333;
    color: #EEE;
    border: none;
    padding: 15px;
    font-family: monospace;
    font-size: 16px;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
    resize: none;
    border-radius: none;
}

Fix height bug by setting the height to 90% instead of 100%
Fix height bug by setting the height to 90% instead of 100%
