Icones nao aparecem e menu-lateral nao abre

@font-face {
    font-family: 'icones.tff';
    src: url("flex-e-grid-main/font/icones.tff");
}

body {
    background-color: #1D232A;
    font-family: 'Open Sans', 'icones', sans-serif;
    color: #FFFFFF;
}

.cabecalho {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #15191C;
    padding: 8px 16px;
    box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.16);
}

.cabecalho__menu i::before {
    content: "\e904";
    font-size: 24px;
}

.cabecalho__notificacao i::before {
    content: "\e906";
    font-size: 24px;
}

.cabecalho__logo {
    width: 40px;
}

.menu-lateral {
    display: flex;
    flex-direction: column;
    background-color: #15191C;
    width: 75vw;
    height: 100vh;

    position: absolute;
    left: -100vw;
    transition: .25s;
}

.menu-lateral--ativo {
    left: 0;
    transition: .25s;
}

.menu-lateral__logo {
    width: 118px;
    align-self: center;
    padding: 16px;
}

.menu-lateral__link {
    height: 64px;
    color: #95999C;
    text-decoration: none;
    padding-left: 64px;
    display: flex;
    align-items: center;
}

.menu-lateral__link--ativo {
    color: #FFFFFF;
    padding: 56px;
    border-left: 8px solid #FFFFFF;
}

.menu-lateral__link::before {
    content: "\e900";
    width: 24px;
    height: 24px;
    font-size: 24px;
    position: absolute;
    left: 24px;
}

.menu-lateral__link--inicio::before {
    content: "\e902";
}

.menu-lateral__link--videos::before {
    content: "\e90e";
}

.menu-lateral__link--picos::before {
    content: "\e909";
}

.menu-lateral__link--integrantes::before {
    content: "\e903";
}

.menu-lateral__link--camisas::before {
    content: "\e900";
}

.menu-lateral__link--pinturas::before {
    content: "\e90a";
}

HTML

STYLE.CSS

.menu-lateral__link {
    height: 64px;
    color: #95999C;
    text-decoration: none;
    padding-left: 64px;
    display: flex;
    align-items: center;
}

.menu-lateral__link--ativo {
    color: #FFFFFF;
    padding: 56px;
    border-left: 8px solid #FFFFFF;