style.css

input#apk-file {
    display: block;
    opacity: 0;
    position: absolute;
    width: 100%;
    height: 100%;
}

content {
    text-align: center;
}

label {
    display: flex;
    width: 300px;
    align-items: center;
    background: hsl(74, 57%, 48%);
    text-align: center;
    align-content: center;
    position: relative;
    cursor: pointer;
    margin: -15px auto 20px auto;
    border-radius: 0px 20px 20px 20px;
    flex: 1;
}

b {
    width: 100%;
    padding: 5px 15px;
    word-break: break-all;
}

header {
    width: 100%;
    text-align: center;
    height: 180px;
    display: flex;
    align-items: center;
    align-content: center;
    background: linear-gradient(to top, hsl(0, 0%, 100%) 15% , hsla(74, 57%, 48%, 0.8));
}

h2 {
    width: 100%;
    margin-top: -10px;
}

body {
    margin: 0;
}

img#apk-icon {
    width: 64px;
    vertical-align: middle;
    display: block;
    margin: 0 auto;
    border-radius: 33px;
}

textarea#channels-input {
    display: block;
    width: 400px;
    height: 200px;
    margin: 0 auto;
    border: 1px dashed yellow;
    border-radius: 5px;
    box-shadow: 0px 0px 5px 0px rgba(158, 191, 53, 0.85) inset;
    padding: 8px;
    flex: 1;
}

#apk-list {
    list-style: none;
    display: block;
    margin: 10px 50px;
    padding: 0;
    text-align: center;
}

span.apk {
    margin: 8px;
    padding: 8px 12px;
    background: hsl(74, 57%, 48%);
    border-radius: 9px;
    box-shadow: 1px 1px 4px rgba(128, 128, 128, 0.81);
    transition: all ease .2s;
    cursor: pointer;
    user-select: none;
    display: inline-block;
    word-break: break-all;
}

span.apk:hover {
    box-shadow: 1px 1px 12px gray;
    transform: translate(-1px , -1px);
}

img {
    width: 24px;
    vertical-align: middle;
    margin-left: 4px;
    border-radius: 6px;
}

.all {
    display: block;
    margin: 0 auto;
    margin-top: 24px;
    background: hsl(74, 57%, 48%);
    border-radius: 9px;
    box-shadow: 1px 1px 10px 0px rgba(160, 192, 52, 0.8);
    cursor: pointer;
    padding: 8px 20px;
    flex: 1;
    font-size: 115%;
}