HTML
<input type="file" class="custom-file-input">
CSS
.custom-file-input {
color: transparent;
}
.custom-file-input::-webkit-file-upload-button {
visibility: hidden;
}
.custom-file-input::before {
content: 'Файл не выбран';
color: black;
display: inline-block;
background: -webkit-linear-gradient(top, #f9f9f9, #e3e3e3);
border: 1px solid #999;
border-radius: 3px;
padding: 5px 8px;
outline: none;
white-space: nowrap;
-webkit-user-select: none;
cursor: pointer;
text-shadow: 1px 1px #fff;
font-weight: 700;
font-size: 10pt;
}
.custom-file-input:hover::before {
border-color: black;
}
.custom-file-input:active {
outline: 0;
}
.custom-file-input:active::before {
background: -webkit-linear-gradient(top, #e3e3e3, #f9f9f9);
}
https://codepen.io/Awilum/pen/WNoExOG