.centered_form {
    @extend .col-md-4;
    @extend .col-md-offset-4;
    @extend .col-sm-6;
    @extend .col-sm-offset-3;

    input[type=submit] {
        @extend .btn;
        @extend .btn-primary;
        @extend .btn-lg;
        @extend .btn-block;
    }
}

.account_form {
    @extend .col-md-10;
    @extend .col-md-offset-1;
    @extend .col-lg-8;
    @extend .col-lg-offset-2;

    input[type=submit] {
        @extend .btn;
        @extend .btn-primary;
        @extend .btn-lg;
        @extend .btn-block;
    }
}

.form-horizontal {
    div.boolean {
        padding: 10px;
        @extend .col-sm-offset-3;
    }
}

.avatar_box {
    @extend .text-center;
    padding-bottom: 2em;
}

.edit_gravatar {
    @extend .img-thumbnail;

    position: relative;

    .overlay {
        @extend .text-center;
        background-color: rgba(225, 238, 255, 0.9);
        border-radius: 5px;
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        top: 0;
        z-index: 1;
        display: none;
    }
}
.centered_form {
    @extend .col-md-4;
    @extend .col-md-offset-4;
    @extend .col-sm-6;
    @extend .col-sm-offset-3;
}

input[type=submit] {
    @extend .btn;
    @extend .btn-primary;
    @extend .btn-lg;
    @extend .btn-block;
}

.account_form {
    @extend .col-md-10;
    @extend .col-md-offset-1;
    @extend .col-lg-8;
    @extend .col-lg-offset-2;
}

.form-horizontal {
    div.boolean {
        padding: 10px;
        @extend .col-sm-offset-3;
    }
}

.avatar_box {
    @extend .text-center;
    padding-bottom: 2em;
}

.edit_gravatar {
    @extend .img-thumbnail;

    position: relative;

    .overlay {
        @extend .text-center;
        background-color: rgba(225, 238, 255, 0.9);
        border-radius: 5px;
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        top: 0;
        z-index: 1;
        display: none;
    }
}
Fix a bug with the .centered_form styles
Fix a bug with the .centered_form styles

The .centered_form elements were not being centered in Chrome. Taking
out the input[type=submit] fixes this bug for some reason. Not sure why.
