.html,
body {
    width: 100%;
    margin: 0;
}

.d-flex {
    display: flex
}

.d-flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.m-auto {
    margin: auto;
}

.m-t-5 {
    margin-top: 5px
}

.m-b-5 {
    margin-bottom: 5px
}

.m-t-10 {
    margin-top: 10px
}

.m-b-10 {
    margin-bottom: 10px
}

.m-t-15 {
    margin-top: 15px !important
}

.m-b-15 {
    margin-bottom: 15px !important
}

.m-t-30 {
    margin-top: 30px !important
}

.m-b-30 {
    margin-bottom: 30px !important
}

.header {
    height: 86px;
    width: 100%;
    background-color: rgb(58, 113, 184)
}

.container-cus-center {
    width: 90%;
    max-width: 500px;
    margin-right: auto;
    margin-left: auto;
    display: flex;
    flex-direction: column;
}

.headline {
    font-size: 22px;
    font-family: Helvetica, Arial, sans-serif;
    color: #3a71b8;
    text-align: center;
    font-weight: normal;
    padding: 30px 0 20px;
}

.sub-headline {
    font-size: 22px;
    color: #000000;
    font-family: Helvetica, Arial, sans-serif;
    padding: 0 0 5px 0;
    text-align: center;
    padding: 20px 0 15px;

}

.footer {
    height: 78px;
    background-color: #333333;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cus-link {
    color: white;
    text-align: center;
    margin: auto;
    font-size: 12px;
    font-family: Helvetica, Arial, sans-serif;
}

.text-content {
    padding: 10px 0 15px;
    font-size: 16px;
    line-height: 24px;
    font-family: Helvetica, Arial, sans-serif;
    color: #666666;
    text-align: center;
}

.cus-button {
    font-size: 16px;
    font-family: Helvetica, Arial, sans-serif;
    color: white;
    padding: 15px 25px;
    border: 1px solid #3a71bb;
    background-color: #3a71bb;
    border-radius: 3px;
    transition: 0.3s;
    margin: 30px auto 25px;
    text-decoration: none;
}

.cus-button:hover {
    background-color: #2c5ca7;
}

.cus-ad {
    margin: 30px auto;
}