body {
    overflow: hidden;
    background-color: #9c9c9c;
}

.caixa-login {
    
    width: 320px;
    height: 431px;
    min-height: 88px;
    position: absolute;
    top: 50%;
    right: 50%;
    transform: translate(50%,-50%);
    z-index: 1;
    background-color: rgb(255, 255, 255);
    
    border-top: 23px solid rgb(239, 239, 239);
    border-right: none;
    border-bottom: 8px solid rgb(239, 239, 239);
    border-left: none;
    border-image: initial;
    border-radius: 0px;
    box-shadow: rgba(0, 0, 0, 0.2) 3px 3px 1px 0px;
}
.botao-login {
    width: 100%;
    height: 30px;
    font-weight: bold;
    text-decoration: none;
    border: none;
    border-color: #00AFF9;
    background: #00A;
    cursor: pointer;
    -webkit-transition: 0.2s ease-in;
    -moz-transition: 0.2s ease-in;
    -o-transition: 0.2s ease-in;
    transition: 0.2s ease-in
}