.input__upload {
    display: inline-block;
    cursor: pointer;
    margin: 1px 0;
}
.input__upload__input {
    display: inline-block;
    position: absolute;
    z-index: -1000;
}
.input__upload__selection {
    text-align: center;
    font-size: 1.2em;
    border: 1px solid #222;
    padding: 5px 10px;
    background: #222;
    color: #fff;
    border-radius: 2px;
    box-shadow: inset 0 0 4px #111;
    transition: border-color .2s;
    overflow: hidden;
    word-wrap: break-word;
}
.input__upload:focus-within .input__upload__selection,
.input__upload__input:focus ~ .input__upload__selection,
.input__upload__input:active ~ .input__upload__selection {
    border-color: var(--accent-colour);
}